2012 Element 7 pool
197 / 600 questions need explanations
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A manual ship-ship ARQ message would typically begin with what sequence of ARQ procedures?
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Initiate call with CS selcal, observe exchange of answer-backs (WRU-AAB), send message. (16% chose this)
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Initiate call with ship selcal, enter "HERE IS" then "WRU" commands and send message. (18% chose this)
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After phasing with the other vessel, observe exchange of answer-backs (WRU-AAB), send message and then KKKK to end the transmission. (26% chose this)
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After phasing with the other vessel then send GA+? to determine if they are ready to receive your message. (40% chose this)
A vessel is tracking the AOR-E satellite. To initiate an operator assisted ship-to-shore telephone contact to a shoreside party in the U.S.A., # 202-456-7890, through a European Earth Station, a valid Inmarsat operations/dialing sequence would be?
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Select LES: 001# then dial 1112024567890 (13% chose this)
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Select LES: 012# then dial 1112024567890# (25% chose this)
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Select LES: 001# then dial 0012024567890# (37% chose this)
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Select LES: 001+ then dial 202 4567890 (25% chose this)
What information should be sent in a detailed satellite Distress message that was not included in the initial "hot-key" Distress Alert?
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Name/Call sign of vessel, vessel position, vessel description, all vessel I.D. numbers, LES code for Distress traffic. (18% chose this)
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POB, vessel description, all vessel I.D. numbers, shore contact numbers, vessel position. (8% chose this)
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Name/Call sign of vessel, POB, vessel description, all vessel I.D. numbers and shore contact numbers. (26% chose this)
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Name/Call sign of vessel, nature of Distress, POB, vessel description and all vessel I.D. numbers. (48% chose this)
A Distress Priority DSC call may be formatted and transmitted specifying and requesting:
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Nature of Distress, vessel position, follow-on frequency, only voice follow-on communications. (48% chose this)
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Nature of Distress or alternate frequency but not both in a single call, vessel position or alternate frequency/emission but not both in a single call, voice or TELEX follow-up communications. (30% chose this)
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Nature of Distress or alternate frequency but not both in a single call, vessel position or alternate frequency/emission but not both in a single call, only TELEX follow-up communications (9% chose this)
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Nature of Distress, vessel position, follow-on frequency, only TELEX follow-on communications. (13% chose this)
Detailed Distress situation report message formats can best be found in?
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IAMSAR manual Volume III. (27% chose this)
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ITU list of RCC and Coast stations. (19% chose this)
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AMVER chapter of NGA PUB 117. (15% chose this)
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FCC Title 47, Part 80. (38% chose this)
To make a call to another vessel requesting voice communications regarding important company business, the GMDSS operator should:
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Select Routine priority, enter other vessel's MMSI, specify legal alternate frequency, J2B emission and transmit the properly formatted DSC call. (34% chose this)
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Select Routine priority, enter own vessel's MMSI, specify legal alternate frequency, J3E emission and transmit the properly formatted DSC call. (35% chose this)
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None of these answers is correct. (28% chose this)
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Select Urgency priority, enter other vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call. (3% chose this)
Why is the automatic answerback request (WRU) first used by the LES after an Inmarsat-B TELEX call has been placed from a ship?
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Let the LES operator know the printer is functioning correctly. (3% chose this)
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Get the identity of the ship station and start the channel assignment process. (25% chose this)
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Verify that there is a good connection with no transmission errors. (42% chose this)
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Identify the SES making the request. (30% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine on a vessel's Inmarsat-B terminal in the AOR-E?
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581366269025 (34% chose this)
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870466269025 (16% chose this)
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870323972514 (29% chose this)
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581761138138 (21% chose this)
A DSC Distress call is received by your vessel and your transceiver frequency display reads: Transmit = 4207.5 kHz and Receive = 4207.5 kHz with J3E emission -- what information can you infer from this?
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The DSC call requested voice on 4207.5 kHz simplex but the requested alternate frequency is improper. (35% chose this)
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The DSC controller decoded the requested voice frequency as 4207.5 kHz simplex and your DSC controller has automatically set-up your transceiver and therefore the requested alternate frequency is correct. (32% chose this)
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The DSC call came in on 4 MHz DSC. You should set-up your transmitter and respond on the appropriate voice follow-on frequency of 4177.5 kHz. (8% chose this)
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The DSC call came in on 4 MHz DSC. You should set-up your transmitter and respond on the appropriate voice follow-on frequency of 4207.5 kHz. (26% chose this)
When requesting a direct TELEX connection to a vessel's Inmarsat-B terminal, (i.e. making a SITOR (NBDP) call to an Inmarsat-B unit) the GMDSS operator must:
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DIRTLX, 0, Ocean Area Code, TELEX number, +. (34% chose this)
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DIRTLX, 00, Ocean Area Code, TELEX number, +. (27% chose this)
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DIRTLX, 0, Country code, TELEX number, +. (24% chose this)
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DIRTLX, 00, Country code, TELEX number. (15% chose this)
Which statement is false regarding an Inmarsat Distress request?
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The NCS in each ocean region automatically monitors the processing of such calls by other LESs in that region and processes calls if any anomaly exists in the system. (21% chose this)
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If all satellite channels are busy then one of them will be preempted by a Distress request. (17% chose this)
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Any Distress request is automatically switched to an Inmarsat Distress working frequency. (33% chose this)
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Any request message with Distress priority is automatically recognized by the LES and a satellite channel is instantly assigned. (28% chose this)
Which of the following is a correctly formatted Inmarsat-B address for sending communications to a shoreside TELEX terminal number 440122 in the United Kingdom (TELEX country code 51)?
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51440122 (54% chose this)
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(51)440122+ (1% chose this)
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51440122# (9% chose this)
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51440122+ (36% chose this)
The DIRTLX command should be given to a coast station at what point in time?
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Immediately following the automatic exchange of answerbacks. (21% chose this)
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After receipt of the Go Ahead indication following the automatic exchange of answerbacks. (35% chose this)
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After receipt of the Go Ahead indication followed by the automatic exchange of answerbacks. (12% chose this)
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Sent at the beginning of the message to request a direct TELEX connection. (32% chose this)
Which of these statements regarding a multi-frequency MF/HF DSC Distress alert is false?
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Some units transmit on the mandatory MF/HF DSC watch frequencies first, and then on the others. (20% chose this)
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Some units transmit in ascending order of propagation radius to alert nearby ships or shore stations first. (20% chose this)
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May be transmitted in any order programmed by the GMDSSS operator. (34% chose this)
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Multi-frequency alerts work quite differently, depending on the manufacturer and require care and understanding of the feature. (26% chose this)
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
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Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking. (38% chose this)
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Inmarsat-B terminals require gyro and GPS input, in order to enable automatic satellite tracking. (23% chose this)
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Inmarsat-C terminals require only GPS input, in order to enable automatic satellite tracking. (26% chose this)
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Inmarsat-C terminals require AZ/EL setup and GPS input, in order to enable automatic satellite tracking. (13% chose this)
Which of these would not be a bad outcome of an Urgency DSC call to all vessels specifying an alternate TELEX frequency & emission that cause your transceiver to automatically switch?
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The DSC controller decoded the contents of the DSC call and the requested frequency is not on the DUS table/placard but is in the marine band frequencies in the J2B emission. (19% chose this)
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The DSC controller decoded the contents of the DSC call and the requested frequency is on the DUS table/placard in the J3E emission. (29% chose this)
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The DSC controller decoded the contents of the DSC call and the requested frequency is on the DUS table/placard in the J2B emission. (40% chose this)
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The DSC controller decoded the contents of the DSC call and the requested frequency is not on the DUS table/placard, is not in the marine band or the other vessel requested a J3E emission. (13% chose this)
Selective FEC communications (SFEC) are employed when:
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Multiple stations without a group SELCAL must receive communications without using their transmitters (Radio Silence). (24% chose this)
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Multiple stations must receive communications by using their transmitters to achieve phasing. (6% chose this)
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An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in. (25% chose this)
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An individual station must receive communications without using any transmitters (Radio Silence). (44% chose this)
Which automatic TELEX command should be sent by a ship station during SITOR (NBDP) operations to properly address a weather report to the national weather authority?
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WX+ followed by the text of the report. (32% chose this)
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OBS+ then MSG+ to indicate weather report. (7% chose this)
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OBS+ and then send the weather report. (39% chose this)
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GA+? then OBS+ and then send the weather report. (22% chose this)
A vessel is experiencing problems tracking the satellite in an Inmarsat-C SES while at sea. The problem is least likely caused by?
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Extremely heavy rain/snow storms. (22% chose this)
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Local RF interference by in-port cell phone or other radio systems. (41% chose this)
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Shadowing caused by an obstacle, such as a mast, between the SES antenna and the satellite. (26% chose this)
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The vessel is on the fringe of the coverage area of the satellite. (10% chose this)
BFEC SITOR (NBDP) transmissions might be used to?
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Receive Coast station traffic lists, NAVTEX and VHF MSI broadcasts. (22% chose this)
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Send and receive Distress TELEX communications and receive HF MSI or NAVTEX. (45% chose this)
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Receive weather messages or download ARQ Coast Station traffic lists. (22% chose this)
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Receive weather messages and send vessel weather OBS messages. (11% chose this)
How are high seas (HF) radiotelephone communications initially established between a vessel and a public correspondence station?
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The vessel listens for "free signals" and calls the public correspondence station on the SITOR (NBDP) calling channel with the strongest marker signal. (38% chose this)
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The vessel calls and establishes voice contact with the public correspondence station on a channel that the station is known to monitor, and the two stations then proceed with their business. (48% chose this)
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The vessel calls the public correspondence station on VHF Channel 16, and the two stations then switch to the working channel. (13% chose this)
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Public Correspondence Stations operate SITOR (NBDP) only. (2% chose this)
To correctly address a SITOR (NBDP) message and transmit it "live" to a shore-based office the GMDSS operator would dial which sequence:
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DIRTLX0051440344+ (21% chose this)
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DIRTLX051440344+ (39% chose this)
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DIRTLX581440344+ (12% chose this)
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DIRTLX05811500260+ (28% chose this)
A vessel loses Inmarsat-B SES operation after a large course change. Which of the following could most likely cause this?
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Shadowing of the SES antenna by clouds or other weather formations. (26% chose this)
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Misalignment of the shadow correction filter. (6% chose this)
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The vessel sailed beyond the footprint of the satellite coverage. (26% chose this)
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System loses gyro follow-up or a gyro system malfunction. (43% chose this)
What is the primary function of a LES?
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To provide direct communications between the Inmarsat station placing a call and the station receiving the call. (45% chose this)
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To monitor and control communications through the Inmarsat satellite for which it is responsible. (28% chose this)
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To provide multi-mode communications between the Inmarsat station placing a call and the coast radio station that will deliver it. (13% chose this)
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To determine which satellite is best suited to provide communications between the Inmarsat station placing a call and the station receiving the call. (13% chose this)
Which of the following is true of SITOR (NBDP) ARQ mode?
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This is an interactive mode. (42% chose this)
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Each character is repeated three times. (25% chose this)
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Each character is transmitted twice. (21% chose this)
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This mode is generally used to broadcast messages. (13% chose this)
What is the best source of information to find changes or additions to the routine communications frequencies of a Commercial Radio Station?
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GMDSS Master Plan of Shore-Based Facilities. (6% chose this)
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ITU List of Coast Stations and Special Service Stations. (List IV) (43% chose this)
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FCC Part 80, Subpart W Coast Radio Stations. (20% chose this)
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ITU List of Ship Stations and Maritime Mobile Service Identities. (List V) (30% chose this)
What sequence of ARQ codes matches the following: Send synoptic weather, switch control from a station currently transmitting over to the receiving station, terminate phasing with coast station.
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OBS+, +?, BRK+ (45% chose this)
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OBS+, WRU then Here is, BRK+ (14% chose this)
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OBS+, GA+?, KKKK (29% chose this)
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AMV+, +?, KKKK (12% chose this)
A vessel with an 18-hour ETA to the Panama Canal on a voyage from Miami loses the ability to communicate via Inmarsat. The most likely cause is?
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The vessel has sailed beyond the coverage area of the Southbury Land Earth Station. (6% chose this)
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The vessel has sailed beyond the coverage area of the Eastern Atlantic satellite. (20% chose this)
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The vessel has sailed beyond the coverage area of the Western Atlantic satellite. (31% chose this)
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An equipment fault resulting in a loss of signal from the satellite. (44% chose this)
All country codes which are transmitted by MF/HF SITOR (NBDP) are preceded by which character(s)?
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00 (25% chose this)
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+ (21% chose this)
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0 (46% chose this)
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DIR (7% chose this)
Which of the following would be a valid automatic TELEX code and number for a request for a real-time TELEX connection to a shore-based TELEX terminal?
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DIRTLX then waits for MSG+ to dial 023419645+. (4% chose this)
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DIRTLX23122445+. (9% chose this)
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DIRTLX followed by GA+? and the TELEX number. (40% chose this)
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DIRTLX023424998+. (46% chose this)
What can be defined as the service that allows terrestrial information providers to send general information messages to pre-defined groups of subscribers?
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SafetyNET™ (43% chose this)
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FleetNETTM (42% chose this)
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COSPAS-SARSAT (9% chose this)
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InfoNET (5% chose this)
Which of the following statements concerning SITOR (NBDP) communications is true?
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FEC transmissions are made in data groups consisting of three-character blocks. (34% chose this)
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FEC transmissions require a "phasing" or "handshaking" process prior to character transmission. (9% chose this)
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FEC transmissions rely upon an error correction technique, which transmits each character twice. (42% chose this)
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FEC transmissions rely upon parity and "repeat requests" to ensure error correction. (14% chose this)
Which statement best defines the SITOR (NBDP) acronym "BFEC"?
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Error correction for one-way TELEX broadcasts of weather or navigation information. (47% chose this)
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Error Correction when 2 stations are in direct & phased telephone communications with each other. (7% chose this)
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Error Correction when 2 stations are in direct & phased TELEX communications with each other. (31% chose this)
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Error correction when 1 station sends a one-way TELEX to a single other station. (15% chose this)
What statement is true regarding LES codes and Inmarsat "hot-key" alert default menus?
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Automatic or manual updating of the LES code only needs to be done when switching to a different ocean region satellite. (18% chose this)
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The SAR jurisdiction software automatically updates the "hot-key" menu based on the vessel's position. (13% chose this)
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The LES code is determined by the NAVAREA based on the vessel's current position. (16% chose this)
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The LES code must be updated by the officers depending upon the SAR jurisdictions the vessel transits and current ocean region satellite in use. (52% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending TELEX communications to a vessel in the IOR?
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853446323868 (12% chose this)
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583446976519 (46% chose this)
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582446323868 (23% chose this)
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870446976519 (19% chose this)
Which statement is correct regarding HF SITOR (NBDP) under GMDSS?
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Distress communications other than directly to the Coast Guard or other coast stations on the channels that they normally guard, should be in the broadcast SSB mode. (5% chose this)
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Safety communications by direct-printing telegraphy should be in the ARQ mode when communicating with the U.S. Coast Guard or other coast stations on channels that they normally guard. (44% chose this)
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The ARQ mode may not be used subsequently to the FEC mode even when it is advantageous to do so. (14% chose this)
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Distress communications other than directly to the Coast Guard or other coast stations on the channels that they normally guard, should be in the broadcast FEC or SSB mode. (37% chose this)
For ARQ communications with a Public Correspondence Coast Station, which sequence of events best describes reaching the point in time where the text of TELEX communications should be sent.
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Transceiver setup, SELCAL selection, Initiate Call, wait for exchange of answer-backs (WRU-AAB), OPR+, operator entry of the appropriate automatic TELEX code. (16% chose this)
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Transceiver setup, wait for exchange of answer-backs (WRU-AAB), OPR+, operator entry of the appropriate automatic TELEX code. (7% chose this)
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Transceiver setup, SELCAL selection, Initiate Call, wait for exchange of answer-backs (WRU-AAB), GA+?, enter DIRTLX xy+, MOM, MSG+? and exchange of terminal answerbacks. (46% chose this)
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Transceiver setup, wait for exchange of answer-backs (WRU-AAB), GA+? and then send message text. (30% chose this)
Which of the following is a correct dialing sequence for a vessel tracking the AOR-W satellite to send a FAX to a U.S. destination via Southbury LES -- using an Inmarsat-B terminal and charging it to a credit card?
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003# 1112125365110# (15% chose this)
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001# 3615036943254# (47% chose this)
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001+ 110243674932+ (19% chose this)
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001# 0015036684376# (19% chose this)
If the vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:
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Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI. (24% chose this)
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Request repairs of the Sat-C system and wait until within range of NAVTEX. (0% chose this)
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Select 518 kHz FEC TELEX on the MF/HF console to receive MSI. (45% chose this)
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Select an HF MSI frequency and ARQ TELEX mode to receive MSI. (31% chose this)
Which of the following statements concerning SITOR (NBDP) communications is true?
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Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received. (9% chose this)
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All of these answers are true. (46% chose this)
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Weather broadcasts cannot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long. (3% chose this)
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Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts. (42% chose this)
What sequence of ARQ codes matches the following: shore station indicates it is awaiting instructions from the vessel, vessel requests a live connection to a land telex number, vessel indicates it is done with the coast station?
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WRU-AAB, DIRTLX, NNNN (20% chose this)
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GA+?, DIRTLX, BRK+ (48% chose this)
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GA+?, DIRTLX, KKKK (28% chose this)
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WRU-AAB, DIRTLX, ..... (4% chose this)
To send message traffic to an Internet address using an Inmarsat- C terminal -- what action would be required?
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Select the recipient using the e-mail code from the address book (or manually select the code.) (53% chose this)
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Insert the Internet address into the correct field when creating the message file. (19% chose this)
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Select the recipient using the e-mail code into the DNID/ENID setup e-mail function. (11% chose this)
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Insert the Internet address into the correct field of the System setup e-mail function. (16% chose this)
To request medical assistance from Inmarsat via voice (using an Inmarsat-B SES) what would be the correct procedure?
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Enter 36# and then the phone number for the Inmarsat medical advisory system. (12% chose this)
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Enter 32# and then the phone number for the Inmarsat medical advisory system. (18% chose this)
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Enter 32# to request the Inmarsat medical advisory system. (45% chose this)
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Enter 32+ to request the Inmarsat medical advisory system. (25% chose this)
If the vessel is beyond range of NAVTEX broadcasts and the Inmarsat-C system fails, the GMDSS operator must:
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Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI. (15% chose this)
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Request repairs of the Sat-C system and wait until within range of NAVTEX. (4% chose this)
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Select 518 kHz FEC TELEX on the MF/HF console to receive MSI. (34% chose this)
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Select an HF MSI frequency and FEC TELEX mode to receive MSI. (46% chose this)
When Inmarsat-B and Inmarsat-C terminals are compared:
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Inmarsat-C antennas are smaller, with active parabolic antennas but no rewind capability. (24% chose this)
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Inmarsat-C antennas are smaller, with passive non-parabolic antennas but no rewind capability. (44% chose this)
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Inmarsat-B antennas are larger, with passive non-parabolic antennas that require rewind capability. (16% chose this)
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Inmarsat-B antennas are larger, with stationary parabolic antennas but no rewind capability. (16% chose this)
The purpose of "parity" in SITOR (NBDP) communications is?
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Error correction in HF BFEC MSI broadcasts, SFEC NAVTEX broadcasts and two way ARQ exchanges. (22% chose this)
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Error correction in SFEC NAVTEX broadcasts, HF SFEC MSI broadcasts and two-way ARQ exchanges. (21% chose this)
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Error correction in BFEC NAVTEX broadcasts, HF BFEC MSI broadcasts and one-way ARQ broadcasts. (12% chose this)
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Error correction in HF BFEC MSI broadcasts, NAVTEX broadcasts and two-way ARQ exchanges. (45% chose this)
If you are tracking the POR satellite and wish to communicate by voice using LES Santa Paula with another ship tracking the AOR-E satellite what is the proper procedure?
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Select LES: 001# then dial 00870323972310# (43% chose this)
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Select LES: 004# then dial 11582430315036# (16% chose this)
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Select LES: 001# then dial 00851636824323# (23% chose this)
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Select LES: 003+ then dial 00581430326430+ (18% chose this)
What actions should be taken to transmit a detailed satellite Distress message to a RCC handling your vessel's initial "hot-key" Distress Alert?
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Compose a detailed Distress message, attach it to the Distress Alert Setup menu and re-transmit the "hot-key" Distress Alert. (16% chose this)
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Call up and edit a pre-saved detailed Distress message, select the closest LES and press the "hot-key." (16% chose this)
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Compose a detailed Distress message, use the Transmit or SEND/REC menu and send it to both the RCC and to your company emergency contact number. (25% chose this)
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Call up and edit a pre-saved detailed Distress message, use the Transmit or SEND/REC menu, select Distress priority and choose the best LES for the situation. (44% chose this)
To make a call to another vessel requesting TELEX communications regarding important company business, the GMDSS operator should:
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Select Urgency priority, enter other vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call. (9% chose this)
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Select Routine priority, enter own vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call. (7% chose this)
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Select Routine priority, enter other vessel's SELCAL for TELEX specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call. (39% chose this)
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Select Routine priority, enter other vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call. (45% chose this)
A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3500 miles. Toward late afternoon and evening what effect would be noticed?
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Communications should gradually deteriorate and become impossible on this frequency at night. (49% chose this)
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Communications should be maintained with slight improvement in the signal received from the shore station. (9% chose this)
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The gray line effect will prevent communications after dark. (3% chose this)
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Communications should improve and peak at night. (40% chose this)
Upon receipt of SafetyNET™ messages of the Distress or Urgency category on the ship's EGC receiver, what action is required by the GMDSS Radio Operator?
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Manually reset the alarm. (49% chose this)
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No immediate action is required as an audible tone will be generated at the beginning and end of the transmission and a paper printout of the message will be generated. (28% chose this)
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No immediate action is required by the operator since the transmission will be automatically acknowledged by the receiving vessel. (6% chose this)
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A periodic alarm tone will be heard until the radio operator prints the message from the unit's memory. (17% chose this)
The sequence BFEC, SFEC, ARQ best corresponds to which of the following sequences?
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One-way communications to a single station, one-way communications to all stations, two-way communications. (18% chose this)
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One-way communications to all stations, two way communications, one-way communications to a single station. (14% chose this)
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One-way communications to all stations, one-way communications to a single station, two way communications. (49% chose this)
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Two way communications, one-way communications to all stations, two-way communications. (19% chose this)
Which of the following numbers is appropriate for an Inmarsat-B terminal placing a TELEX call via Southbury to another ship logged-in to the AOR-E?
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001+ 00584436824246+ (29% chose this)
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001+ 00581436824246+ (49% chose this)
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002+ 00584436824246+ (11% chose this)
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013+ 00581436824246+ (11% chose this)
What is the primary function of an NCS?
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To provide direct communications between the Inmarsat station placing a call and the station receiving the call. (23% chose this)
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To provide multi-mode communications between the Inmarsat station placing a call and the coast radio station that will deliver it. (12% chose this)
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To determine which satellite is best suited to provide communications between the Inmarsat station placing a call and the station receiving the call. (18% chose this)
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To monitor and control communications through the Inmarsat satellite for which it is responsible. (47% chose this)
Which of the following statements concerning EGC configuration is false?
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NAVAREA selection should be monitored and appropriately updated. (9% chose this)
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The originator of MSI information cannot specify receipt only by vessels within a specific geographical area, circular or rectangular. (52% chose this)
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The originator of MSI information can specify receipt only by vessels within a specific geographical area, circular or rectangular. (21% chose this)
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GMDSS operators generally can select additional NAVAREAS to acquire EGC messages of interest to the vessel. (18% chose this)
Why must the GMDSS operator be able to set-up FEC & ARQ modes and differentiate between them?
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The proper mode of SFEC must be selected for reception of HF MSI and ARQ selected for initial follow-on TELEX communications in a Distress situation (13% chose this)
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The proper mode must be selected for follow-on TELEX communications in a Distress situation and for the reception of HF MSI. (51% chose this)
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The ARQ TELEX mode must be selected for follow-on TELEX communications in a Distress situation and the BFEC TELEX mode selected for reception of HF MSI. (26% chose this)
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The BFEC TELEX mode must be selected for follow-on TELEX communications in a Distress situation and the ARQ TELEX mode selected for reception of HF MSI. (9% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending TELEX communications to a vessel in the AOR-E?
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870436772983 (17% chose this)
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571436772983 (19% chose this)
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581323500120+ (13% chose this)
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581323500120 (51% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number 516-229-4339 in Long Beach, CA, U.S.?
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015162294339# (18% chose this)
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15162294339 (53% chose this)
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015162294339 (28% chose this)
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1 516-229-4339 (1% chose this)
What are potential dangers of automatic transceiver switching in response to a DSC call?
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Incorrectly formatted DSC calls from other vessels result in a warning in the DSC alarm screen but the vessel still might be switched to an illegal or improper outcome. (19% chose this)
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The transceiver may be switched out of the marine bands or the frequency may not match the requested priority or emission. (57% chose this)
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The automatic transceiver switching software always detects improper priorities, emissions & frequencies to ensure there is no danger. (10% chose this)
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The automatic transceiver switching feature always interrupting safe navigation of your own vessel and placing the unit on the GMDSS Distress, Urgency or Safety follow-on frequencies. (14% chose this)
When Inmarsat-B and Inmarsat-C terminals are compared:
-
Inmarsat-B units provide greater communications capabilities, with the benefits of greater size, weight, installation expense and initial cost. (13% chose this)
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Inmarsat-C provides lesser communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost. (7% chose this)
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Inmarsat-B units provide greater communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost. (49% chose this)
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Inmarsat-C units are of smaller size, weight, installation expense and initial cost and provide greater communications capabilities due to modern technology. (32% chose this)
What sequence of ARQ codes matches the following: manual over, end of message text, end of connection to land destination terminal?
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NNNN, KKKK, GA+ (9% chose this)
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KKKK, DIRTLX, NNNN (15% chose this)
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+?, NNNN, KKKK (55% chose this)
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+?, . . . . ., BRK+ (21% chose this)
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
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Both Inmarsat-B and Inmarsat-C units are capable of fax and voice communications. (6% chose this)
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Inmarsat-B units are not capable of data communications, but Inmarsat-C units are capable of data communications. (13% chose this)
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Both Inmarsat-B and Inmarsat-C units can send data as well as send messages to fax machines. (46% chose this)
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None of these answers is correct. (35% chose this)
A ship at anchor has been communicating with a shore station approximately 200 miles distant on a frequency in the 4 MHz band through mid-morning. Toward the late afternoon and evening, what effect should be noticed?
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Communications should be maintained with slight improvement in the signal received from the shore station. (9% chose this)
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Communications should gradually improve and peak at night and early morning. (56% chose this)
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Communications should slowly deteriorate but may be continued throughout the night. (14% chose this)
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Communications should gradually deteriorate and become impossible on this frequency by night. (21% chose this)
What action would be the swiftest and most certain way to notify a RCC of a Distress situation aboard your vessel?
-
Compose a detailed Distress message and send it to the closest LES to optimize the SAR response. (14% chose this)
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Confirm the information in the Distress Alert Message setup menu is correct and use the "hot-key" or Distress Message Generator function on your satellite terminal. (51% chose this)
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Press all of the "hot keys" available in the GMDSS console to ensure the RCC is notified. (26% chose this)
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Send a multi-frequency DSC alert to ensure the RCC is notified regardless of Ionospheric propagation conditions. (10% chose this)
The Inmarsat telephone and TELEX communications channel usage scheme is:
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One ship per telephone channel and many ships per TELEX channel. (50% chose this)
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Many ships on the same TELEX analog channel and many ships on the same TDM telephone channel. (24% chose this)
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One ship per analog telephone channel and one ship per TELEX analog channel frequency. (12% chose this)
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One ship per channel whether telephone or TELEX. (14% chose this)
A Coast Station that is described as ATOR typically provides what type of services?
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NAVTEX BFEC weather broadcasts. (15% chose this)
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ARQ SITOR (NBDP) connections to shoreside terminals. (52% chose this)
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BFEC SITOR (NBDP) connections to shoreside terminals. (15% chose this)
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SITOR (NBDP) HF weather broadcasts. (17% chose this)
From an Inmarsat-C terminal, which of the following are correctly formatted address for sending TELEX messages to two vessels in the AOR-W? First to an Inmarsat-B and second to an Inmarsat-C.
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870366719020 first and 870436671929 second. (24% chose this)
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584436671929 first and 584366719020 second. (11% chose this)
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584366719020 first and 584436671929 second. (51% chose this)
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58136671920 first and 58136671929 second. (14% chose this)
The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?
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One-way communications to a single station, one-way communications to all stations, two-way communications. (20% chose this)
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One-way communications to all stations, two-way communications, one-way communications to a single station. (12% chose this)
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Two way communications, one-way communications to all stations, one-way communications to a single station. (50% chose this)
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Two way communications, One way communications to a single station, One way communications to all stations. (18% chose this)
What must be done to disconnect an incoming TELEX message when voice Distress communications is desired via Inmarsat-B?
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Momentarily turn off the system power. (7% chose this)
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Depressing the "Distress" button automatically disconnects incoming messages. (50% chose this)
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It is necessary to wait until the incoming TELEX message has concluded otherwise a system fault will occur. (28% chose this)
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Depress the "Reset" switch to disconnect incoming message. (15% chose this)
Which mode of communications is NOT possible through an Inmarsat-C SES?
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Shore-to-ship Facsimile (56% chose this)
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Data (15% chose this)
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TELEX (17% chose this)
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Emergency Activation (12% chose this)
An incoming Distress priority 16 MHz DSC call requesting J3E emission might automatically switch to what frequency?
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16420.0 MHz (28% chose this)
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16696.5 kHz (5% chose this)
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16420.0 kHz (50% chose this)
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16804.5 kHz (17% chose this)
If an Inmarsat Distress Alert Setup menu contains an incorrect or unavailable LES code what happens to the Distress Alert transmission?
-
The NCS updates the LES codes in the Distress Alert Setup menu as the vessel moves from ocean region to ocean region to ensure this does not happen. (13% chose this)
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The NCS will send a Distress Alert Setup incorrect LES code alarm so the alert can be corrected and re-transmitted. (22% chose this)
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The NCS will step in and route the Distress Alert transmission to an RCC. (56% chose this)
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If the LES code is incorrect then the Distress Alert transmission is not detected by any RCC. (9% chose this)
Why is the correct selection of the LES in the Distress Alert Setup menu so crucial?
-
Each LES has its own dedicated RCC whose jurisdiction is defined by the LES selected. (24% chose this)
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The LES choice determines the nationality of the RCC which will handle the Distress traffic and perform SAR duties or that will pass the particulars to the RCC with jurisdiction to coordinate the SAR situation. (54% chose this)
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Inmarsat terminals use the GPS position to automatically determine the optimum LES choice in a Distress situation. (13% chose this)
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The vessel need not select the LES because the NCS will always intercept a Distress priority call and route it to the closest RCC. (10% chose this)
When Inmarsat-B and Inmarsat-C terminals are compared:
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Inmarsat-B antennas are larger, but omni-directional, while Inmarsat-C antennas are smaller and parabolic, for aiming at the satellite. (12% chose this)
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Inmarsat-B antennas are parabolic and smaller for higher gain, while Inmarsat-C antennas are larger but omni-directional. (10% chose this)
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Inmarsat-C antennas are smaller, but omni-directional, while Inmarsat-B antennas are parabolic for lower gain. (19% chose this)
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Inmarsat-B antennas are larger, but directional for higher gain, while Inmarsat-C antennas are smaller and non-parabolic, and do not require aiming at the satellite. (58% chose this)
If your vessel is in the POR, which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 42267 in Ecuador (TELEX country code 308)?
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58230842267 (32% chose this)
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30842267+ (17% chose this)
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(582)30842267 (1% chose this)
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30842267 (50% chose this)
Which of the following statements concerning SITOR (NBDP) communications is true?
-
FEC requests are first acknowledged by the vessel's transmitter before broadcasts can be received. (22% chose this)
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FEC mode broadcasts can be passively received without the transmitter being active. (57% chose this)
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Weather broadcasts are always made in ARQ mode to ensure reception. (6% chose this)
-
ARQ mode communications can be passively received without the transmitter being active. (15% chose this)
The acronym SITOR (NBDP) stands for:
-
Simplified Telephony Over Radio (4% chose this)
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Simplex TELEX Over Radio (55% chose this)
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Simplified TELEX Over Radio (23% chose this)
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Simplex Telephony Over Radio (18% chose this)
What is your vessel's obligation upon receipt of a Distress priority EGC message requesting that vessels report in response to a SAR situation?
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Silence the alarm, notify the master and send a message to the RCC with your vessel's position and capabilities. (53% chose this)
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Read the Distress EGC message and if the situation is too far away no response is required. (4% chose this)
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Read the Distress EGC message and await instructions from the RCC as how to proceed to the distress. (10% chose this)
-
Silence the alarm, notify the Master and await instructions from the RCC as to whether your vessel is requisitioned or released from participation in SAR activity. (33% chose this)
"SITOR (NBDP)" communications are based on a digital code system:
-
Consisting of 7 bits, with four zeros and three ones. (51% chose this)
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Consisting of 7 bits, with four ones and three zeroes. (21% chose this)
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Consisting of 5 bits TELEX and 8 bits Fax. (9% chose this)
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Consisting of 5 bits for ship stations and 7 bits for shore stations. (18% chose this)
During ARQ communications, which of these is least likely to cause a coast station to break the phased radio connection:
-
If the error percentage of repeat requests becomes too high. (7% chose this)
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If the operator enters "BRK+". (7% chose this)
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If the automatic exchange of answerbacks is interrupted by keyboard entries. (29% chose this)
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If the operator enters "NNNN" at the end of the message. (57% chose this)
Which of the following is true of SITOR (NBDP) ARQ mode:
-
The ship station sends a group of 3 characters, the shore station checks for proper parity. If parity is OK, the shore station indicates readiness for transmission of the next 3 characters. (62% chose this)
-
The ship station sends a group of 3 characters twice and then waits for an "RQ" signal to indicate proper receipt before continuing transmission. (18% chose this)
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The Ship station sends each character twice, using a time diversity system to ensure proper parity. (12% chose this)
-
The ship station sends a group of 3 characters, the shore station checks for proper parity and then requests the same group be resent to enable error correction. (8% chose this)
What is an MRN?
-
Mobile Registration Number, provided by the FCC. (32% chose this)
-
Mobile Registration Number, provided by IMO. (11% chose this)
-
Message Reference Number, provided by the LES. (56% chose this)
-
Vessel's call sign (1% chose this)
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
-
Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects due to their omni-directional antennas. (7% chose this)
-
Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-B units have directional antennas. (68% chose this)
-
Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-C units have directional antennas. (13% chose this)
-
Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, due to their directional antennas. (12% chose this)
During ARQ communications, which of these is least likely to cause a coast station to immediately break the phased radio connection:
-
If the automatic exchange of answerbacks is interrupted by keyboard entries. (19% chose this)
-
If the error percentage of repeat requests becomes too high. (15% chose this)
-
If the operator enters "KKKK" at the end of the message. (51% chose this)
-
If the BRK+? Command is transmitted after time and charges are received. (15% chose this)
What is the average length of time required for a TELEX sent by Inmarsat-C to be delivered to the addressee?
-
All Inmarsat-C communications are made with real-time connectivity so there is no delay in message delivery. (12% chose this)
-
The average delivery time for a message sent by Inmarsat-C is about 10 minutes. (60% chose this)
-
Date/time notification of delivery is possible only through Inmarsat-B. (1% chose this)
-
The average delivery time for a TELEX sent by Inmarsat-C is about 10 minutes, but fax and data messages sent by Inmarsat-C require about 30 minutes for delivery. (26% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending TELEX communications to two vessels in the POR - the first Inmarsat-C and the second Inmarsat-B?
-
583452998777 first and 583323500120 second. (25% chose this)
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582450302113 first and 582761579051 second. (10% chose this)
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582452998777 first and 582323500120 second. (51% chose this)
-
582600267098 first and 582450302113 second. (14% chose this)
A vessel is tracking the AOR-W satellite. To initiate an automatic ship-to-shore telephone contact to a shoreside party in the U.S. phone # 123-456-7890, via Southbury Earth Station, a valid Inmarsat operations/dialing sequence is?
-
Select LES 001# then dial 0011234567890# (59% chose this)
-
Select LES #002 then dial 11234567890# (9% chose this)
-
Select LES 104# then dial 11234567890+ (4% chose this)
-
Select LES 001+ then dial 123 4567890# (28% chose this)
Which of the following statements concerning SITOR (NBDP) communications is true?
-
In ARQ, each character is transmitted twice, about 250 milliseconds apart. (5% chose this)
-
In ARQ, the "information sending station" will transmit a block of three characters that the receiving station will subsequently acknowledge or request be retransmitted. (66% chose this)
-
In ARQ, the "information sending station" transmits a block of three characters twice, about 250 milliseconds apart. (13% chose this)
-
SITOR (NBDP) communications can be used to contact a NAVTEX transmitting station when requesting a repeat transmission of a missed NAVTEX message. (16% chose this)
What is the normal specific gravity of a fully charged lead acid battery cell? What device is used to measuring the electrolyte of a lead acid battery?
-
1.375 Voltmeter (7% chose this)
-
1.180 Voltmeter (16% chose this)
-
1.210 Hydrometer (22% chose this)
-
1.280 Hydrometer (55% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending TELEX communications to a vessel in the POR?
-
582436559121 (57% chose this)
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870436559121 (22% chose this)
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582436559121+ (12% chose this)
-
583436559121+ (9% chose this)
You are on a ship in the Pacific ocean. What keyboard entry would you make on an Inmarsat-B terminal to obtain a TELEX connection via Santa Paula to another ship that is 300 miles west of San Francisco?
-
001# 00582430353680# (14% chose this)
-
003+ 00582430353680+ (23% chose this)
-
001+ 00582336657450+ (55% chose this)
-
002+ 00582336850450+ (8% chose this)
Which of the following would be a valid SELCAL for use in ARQ communications?
-
1106 (58% chose this)
-
212420 WHAQ X. (8% chose this)
-
Four marks (ones) and three spaces (zeroes) forming the binary signal "1001101". (15% chose this)
-
This is established by the communications protocol used with the modem. (18% chose this)
What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?
-
Painting the antenna dome. (22% chose this)
-
Adjust the station's EIRP. (8% chose this)
-
Adjust any front panel controls. (57% chose this)
-
Adjust a reference oscillator or synthesizer. (14% chose this)
If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:
-
Select one of the 8 HF MSI frequencies and set-up the transceiver in FEC TELEX mode. (54% chose this)
-
Select one of the 6 HF MSI frequencies and set-up the transceiver in ARQ TELEX mode. (13% chose this)
-
Select one of the 6 MF MSI frequencies and set-up the transceiver in FEC TELEX mode. (17% chose this)
-
Select the MF MSI frequency dedicated to tropical MSI and set-up the transceiver in FEC TELEX mode. (17% chose this)
What is the best method for a GMDSS Radio Operator to determine which SITOR (NBDP) station to contact for the purpose of sending a chargeable message or cable?
-
Listen to each station's "free signals" and call the strongest station. (63% chose this)
-
Listen to each station's voice announcement and determine which channel(s) will be monitored. (7% chose this)
-
Listen to each station's MSI broadcast to determine which public correspondence station to contact. (15% chose this)
-
Listen to the U.S. Coast Guard's traffic list to determine which Coast Guard station will handle commercial traffic. (15% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 45992 in Taiwan (TELEX country code 769)?
-
76945992+ (35% chose this)
-
None of these answers is correct. (57% chose this)
-
769 45992+ (7% chose this)
-
(769)45992 (1% chose this)
Which of the following statements concerning SITOR (NBDP) communications is true?
-
ARQ transmissions are acknowledged by the Information Receiving Station only at the end of the message. (6% chose this)
-
ARQ transmissions are made in data groups consisting of three-character blocks. (62% chose this)
-
ARQ communications rely upon error correction by time diversity transmission and reception. (13% chose this)
-
Forward error correction is an interactive mode. (19% chose this)
What is the correct procedure for calling a coast radio station using HF radiotelephone?
-
On a properly selected ITU channel, give the name of the coast radio station being called three times, and the words "this is" followed by the name of the ship initiating the call three times, and ending with "over". (36% chose this)
-
Contact the nearest U.S.C.G. station to add the desired ship's call sign to the station's traffic list. (1% chose this)
-
Request the VTS operator place the call on channel 22A. (3% chose this)
-
On a correct ITU channel, give the call sign of the coast radio station three times using phonetics, the words "this is", followed by the ship's call sign three times using phonetics and ending with "over". (60% chose this)
At mid-day, what would be the best choice in attempting to communicate with a shore station some 75 miles distant?
-
MF (64% chose this)
-
VHF-FM (19% chose this)
-
22 MHz band (6% chose this)
-
16 MHz band (10% chose this)
What is the primary danger of improperly logging out?
-
The vessel will be barred in the future from sending traffic through an LES. (3% chose this)
-
The NCS ensures that improper log-out procedures do not occur. (3% chose this)
-
Scheduled MSI may not be available through the Inmarsat-C terminal. (30% chose this)
-
Your company or another ship may accrue significant charges when their traffic is repetitively sent to your unavailable terminal. (64% chose this)
How is a signal radiated from an Inmarsat-B or F77 system's antenna?
-
It is usually radiated in an omni-directional pattern, but an optional feature allows it to be directional for use when the vessel is on the fringe of the satellite's footprint. (5% chose this)
-
It is a highly focused directional signal that must be beamed at the desired satellite. (59% chose this)
-
It is radiated in an omni-directional pattern. (32% chose this)
-
It is radiated in an omni-directional pattern that can be reversed by the Operator to attain directional beaming to an alternate satellite. (4% chose this)
Which of these is not a primary purpose of the MF/HF DSC controller?
-
It provides for the electronic memory of incoming and outgoing DSC calls. (20% chose this)
-
It permits control of transceiver operations in response to an incoming DSC call. (16% chose this)
-
It provides for the formatting and transmission of outgoing DSC calls. (7% chose this)
-
It provides the scanning watch receiver capability on the 6 MF/HF DSC frequencies. (58% chose this)
How may Inmarsat-C terminals be used for sending Urgency or Safety priority communications (such as synoptic weather reports)?
-
Urgency & Safety EGC messages can only be received by an Inmarsat-C terminal. (12% chose this)
-
Enter PAN PAN or SECURITE into the heading of the message file so the message will be routed by priority. (17% chose this)
-
Only Routine or Distress priority messages can be sent from an Inmarsat-C terminal. (7% chose this)
-
Use the appropriate special 2-digit codes selected from the address book or manually enter the correct code into the SEND/REC or TRANSMIT menu. (64% chose this)
Assuming sending a direct TELEX message to a shore-based office, which sequence of events best describes a complete ARQ TELEX exchange with a coast station?
-
Initiate call, observe phasing, wait for exchange of answer-backs (WRU-AAB), send message, send KKKK to terminate the TELEX link, receive MRN & time and charges. (18% chose this)
-
Initiate call, observe phasing, wait for exchange of answer-backs (WRU-AAB), send DIRTLX command with zero, TELEX country code, TELEX number, send message, send KKKK to terminate the TELEX link, receive MRN and time and charges. (65% chose this)
-
Initiate call, observe exchange of answer-backs (WRU-AAB), send message, send KKKK to terminate radio link, receive MRN & time and charges. (7% chose this)
-
Initiate call, observe phasing, exchange of answer-backs (WRU-AAB), send message, send KKKK to terminate radio link, receive MRN & time and charges. (10% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending TELEX communications to an Inmarsat-B terminal in the AOR-W?
-
584765044177 (7% chose this)
-
584331014013 (59% chose this)
-
870331014013 (15% chose this)
-
584331014013+ (19% chose this)
How is a signal radiated from an Inmarsat-C system's antenna?
-
It is a highly focused directional signal that must be beamed at the desired satellite. (22% chose this)
-
It is usually radiated in an omni-directional pattern, but an optional feature allows it to be directional for use when the vessel is on the fringe of the satellite's footprint. (6% chose this)
-
It is radiated in an omni-directional pattern. (65% chose this)
-
It is radiated in an omni-directional pattern that can be reversed by the Operator to attain directional beaming to an alternate satellite. (7% chose this)
Which Inmarsat Earth stations would be available for Inmarsat-C traffic if the vessel is off the Pacific Coast of the United States but logged-in to the AOR-W satellite?
-
EIK (Norway), Tangua (Brazil), Thermopylae (Greece) (6% chose this)
-
Southbury (USA), Burum (Netherlands), or EIK (Norway). (63% chose this)
-
Santa Paula (USA), Psary (Poland), Yamaguchi (Japan). (29% chose this)
-
Beijing (PRC), Fucino (Italy), Nudol (Russia). (3% chose this)
Which LES should a GMDSS Radio Operator select to update a Distress alert message if the vessel is in the southern Pacific Ocean near the Dateline?
-
Santa Paula (USA) or Beijing (PRC) would be the best choice depending on SAR jurisdiction. (21% chose this)
-
Kumsan (South Korea) or Sentosa (Singapore) would be the best choice depending on SAR jurisdiction. (7% chose this)
-
Yamaguchi (Japan) or Nakhoda (Russia) would be the best choice depending on SAR jurisdiction. (7% chose this)
-
Auckland (New Zealand) or Santa Paula (USA) would be the best choice depending on SAR jurisdiction. (65% chose this)
What is the purpose of the second I.D. in an Inmarsat-B or F77 SES?
-
To provide an alternate number which may be called if a busy signal is received by the calling party. (17% chose this)
-
To provide an additional speech path, which may be used to communicate while the first channel is engaged in active communications. (18% chose this)
-
To provide for an emergency working frequency. (8% chose this)
-
To provide an additional number which may be dedicated to computers, fax, etc. (57% chose this)
Which statement concerning frequency band selection and propagation most corresponds with standard practice.
-
Maximum Usable Frequency (MUF) and Optimum Usable Frequency (OUF) should be calculated prior to setting up the transceiver. (12% chose this)
-
Propagation rules, Sunspot cycle status and seasonal variations (winter & summer) must always be employed to calculate the proper band selection. (16% chose this)
-
Propagation "rules of thumb" should be combined with Solar flare alerts to determine band selection. (7% chose this)
-
Propagation "rules of thumb" are usually sufficient for routine operations. (65% chose this)
What is meant by the characters GA+ on an Inmarsat terminal?
-
Go ahead for store & forward telex operations. (30% chose this)
-
The instruction to "give address". (1% chose this)
-
Go ahead for live telex operations. (59% chose this)
-
General Address (to all stations). (9% chose this)
FEC SITOR (NBDP) transmissions are normally used to?
-
Receive Coast station traffic lists, NAVTEX and VHF MSI broadcasts. (24% chose this)
-
Receive weather messages, Coast Station traffic lists and company messages. (10% chose this)
-
Receive HF MSI and NAVTEX. (63% chose this)
-
Receive company communications sent through coast stations. (4% chose this)
What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?
-
Adjust the station's EIRP (power output ) for improved signal levels. (16% chose this)
-
Enter Azimuth and Elevation values correctly so the Inmarsat-C SES can find the NCS CC. (13% chose this)
-
Remove stack deposits and other debris from the antenna to prevent degraded performance. (65% chose this)
-
Adjust a reference oscillator or synthesizer to tune the unit to the NCS CC. (6% chose this)
What is the equipment arrangement that provides the maximum availability for reception of MSI broadcasts when using Inmarsat-C for TELEX communications?
-
Separate EGC receiver. (62% chose this)
-
Integrating EGC receiver with the existing Inmarsat-C equipment. (19% chose this)
-
Redundancy using HF SSB to receive voice broadcasts. (12% chose this)
-
Automatic switching between Inmarsat-C and EGC functions. (7% chose this)
What sequence of ARQ codes matches the following: request establishment of a landline, end radio link after traffic is done, request connection for AMVER messages?
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NNNN, KKKK, AMV+ (19% chose this)
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KKKK, BRK+, AMV+ (12% chose this)
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BRK+, DIRTLX+, AMV+ (8% chose this)
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DIRTLX, BRK+, AMV+ (61% chose this)
If your vessel is in the IOR, which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 77829 in the Philippines (TELEX country code 758)?
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75877829+ (17% chose this)
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87375877829 (5% chose this)
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58375877829 (11% chose this)
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75877829 (68% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine on a vessel's F77 terminal in the IOR?
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870763240864 (58% chose this)
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583442519372 (19% chose this)
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1870442519372 (4% chose this)
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870323500121 (18% chose this)
What additional equipment provides the maximum availability for receiving SafetyNET™ broadcasts when the associated Inmarsat-C SES is engaged in communications?
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An integrated EGC receiver with the existing Inmarsat-C equipment. (26% chose this)
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HF SSB can be used to receive voice MSI broadcasts. (9% chose this)
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A separate EGC receiver. (61% chose this)
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Automatic switching between Inmarsat-C and EGC functions. (4% chose this)
What is a gel cell battery and how is it maintained & cared for?
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Gel cell batteries are typically sealed; special charging rates and voltages may be required. (68% chose this)
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Gel cell batteries are lead acid with a solid electrolyte; each cell is checked with a voltmeter. (12% chose this)
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Gel cell batteries are NICAD with a solid electrolyte; each cell is checked with a voltmeter. (6% chose this)
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Gel cell batteries are have special liquid electrolytes; they are charged with the NICAD charging rates and voltages. (15% chose this)
What is the primary purpose of an Inmarsat LES?
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The LES is required for ship-ship Inmarsat communications, ship-shore communications are handled by terrestrial Coast Radio Stations. (8% chose this)
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The LES monitors all operations of the satellite and assigns channels and frequencies to the vessel. (23% chose this)
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The LES makes the satellite connection between the vessel and the requested destination for all types of services. (60% chose this)
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The LES is dedicated only to processing all vessel Distress priority calls. (9% chose this)
Which action must be taken to ensure that incoming message traffic of all priority levels will be received through Inmarsat-C?
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The GMDSS Radio Operator must log-in to the desired satellite (if the unit did not automatically do so.) (61% chose this)
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No additional action is necessary after turning on the receiver and aiming the antenna at the desired satellite. (7% chose this)
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The system needs only to be commissioned and turned on. (9% chose this)
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The GMDSS Radio Operator must log-in to the desired satellite and receive the message reference number (MRN) from the LES. (23% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number 1424-8821-902 in the United Kingdom (voice country code 44)?
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44 1424-8821-902 (7% chose this)
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4414248821902# (20% chose this)
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44+ 14248821902+ (6% chose this)
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4414248821902 (67% chose this)
Which of the following would be a valid sequence to request an automatically dialed ship-ship call to an F77 terminal on a vessel tracking the IOR satellite?
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00583430662888# (8% chose this)
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00870430662888# (7% chose this)
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00583763240864 # (25% chose this)
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00870763240864# (61% chose this)
Of the following, which is true of SITOR (NBDP) ARQ mode?
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The acceptance code consists of three characters. (9% chose this)
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A continuous data stream is transmitted. (8% chose this)
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Forward error correction reduces the number of errors. (11% chose this)
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Each data block consists of three characters. (72% chose this)
How is maximum coverage provided by satellites in the maritime satellite service?
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Four satellites in polar orbit. (4% chose this)
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Four satellites in geo-stationary orbit for each Inmarsat Service (B, C, F77 and M). (13% chose this)
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Four satellites in geo-stationary orbit approximately 22,184 miles above the equator. (70% chose this)
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Through coordinated use of COSPAS-SARSAT satellites. (12% chose this)
What keyboard entry would you make on an Inmarsat-B terminal for an automatic TELEX connection to 882419 in Nebraska, USA (TELEX country code 230)?
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11230882419+ (9% chose this)
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00230882419# (6% chose this)
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00230882419+ (53% chose this)
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00230882419 (32% chose this)
Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.
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FEC reduces the error rate by transmitting each character twice. (70% chose this)
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Data flow rate depends on signal propagation. (12% chose this)
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Idle characters are sent upon request. (4% chose this)
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Transmitter and receiver cannot synchronize. (14% chose this)
GMDSS operators should learn which of the following propagation "rules of thumb"?
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Longer distance = lower frequency, Shorter distance = higher frequency; Daytime = higher frequency, nighttime = lower frequency. (30% chose this)
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Longer distance = lower frequency, Shorter distance = lower frequency, Daytime = lower frequency, nighttime = higher frequency. (6% chose this)
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Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency. (62% chose this)
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Longer distance = higher frequency, Shorter distance = higher frequency, Daytime = lower frequency, nighttime = higher frequency. (1% chose this)
What is the effect of temperature on the specific gravity of lead acid batteries?
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Higher temperature results in a higher specific gravity reading. (19% chose this)
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Higher temperature results in a lower specific gravity reading. (64% chose this)
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Temperature has no effect on the specific gravity reading. (11% chose this)
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Lower temperature results in a lower specific gravity reading. (7% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside terminal number 276992 in New Jersey via TRT (TELEX country code 238)?
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238276992 (76% chose this)
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(238)276992 (0% chose this)
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238276992# (5% chose this)
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238276992+ (19% chose this)
Which Inmarsat Earth Stations could a vessel utilize for Inmarsat-C traffic if operating off the Atlantic Coast of the United States and synched to the AOR-W satellite?
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Southbury (USA), Burum (Netherlands), Eik (Norway). (62% chose this)
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Santa Paula (USA), Aussaguel (France) or Eik (Norway). (15% chose this)
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Southbury (USA), Santa Paula (USA) or Yamaguchi (Japan). (19% chose this)
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Southbury, (USA), Nakhoda (Russia) or Beijing (PRC). (4% chose this)
What would be the most appropriate HF bands for communicating from San Francisco to Taiwan or the Philippines?
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12 MHz during daylight at each end and 2 MHz when dark at each end. (14% chose this)
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8 MHz during daylight hours and 16 MHz during darkness. (7% chose this)
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6 MHz during daylight hours and 8 MHz during darkness. (9% chose this)
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16 or 22 MHz when daylight at each end and 8 MHz when dark at each end. (70% chose this)
Which of the following is not an example of a failure to log-out properly?
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Turning off the power prior to logging out with the NCS. (18% chose this)
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A message on the screen or printer from the NCS. (62% chose this)
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Sailing the vessel into a shadowing or local RF interference situation before logging out. (15% chose this)
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Sailing out of the footprint of a satellite before logging out. (5% chose this)
What would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system?
-
All of these symptoms would indicate a potential battery charger malfunction. (17% chose this)
-
After testing the station on battery power, a voltmeter reading of 30 volts for a brief period followed by a steady 26 volt reading. (3% chose this)
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A constant 30 volt reading on the GMDSS console voltmeter. (73% chose this)
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After testing the station on battery power, the ammeter reading indicates a high rate of charge that then declines. (8% chose this)
It is possible to transmit all of the following via Inmarsat-C from a vessel except?
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TELEX (6% chose this)
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Text for delivery by fax. (13% chose this)
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Voice (68% chose this)
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x.400 data services (14% chose this)
Which number, if typed at an Inmarsat-B SES by a vessel in the Western Atlantic, would result in placing an automatic TELEX call to a subscriber number of 123456?
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00230123456+ (68% chose this)
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00230123456# (14% chose this)
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0012131234567# (11% chose this)
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00 1 213 1234567+ (7% chose this)
Which of the following best describes the full range of services provided by the Inmarsat-C Satellite system?
-
Polling, enhanced group call, and one-way position and data reporting via satellite. (5% chose this)
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FM voice communications via satellite. (3% chose this)
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Two-way messaging and data communications on a store-and-forward basis. (29% chose this)
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Polling, enhanced group call, one-way position and data reporting via satellite, two-way messaging and data communications on a store-and-forward basis. (64% chose this)
What is the best procedure for calling another ship station using HF radiotelephone when the signals are weak but readable?
-
Give the name of the ship being called three times, and the words "this is" followed by the name of the ship initiating the call three times, and ending with "over." (28% chose this)
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Instruct the nearest public correspondence station to add the desired ship's call sign to the station's traffic list. (1% chose this)
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On a properly selected ITU channel, give the call sign of the ship being called three times using phonetics, then "this is" followed by the call sign of the ship initiating the call three times, using phonetics, and ending with "over." (71% chose this)
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Notify the local vessel traffic service control station of your intention to contact a specific vessel, and request the VTS operator place the call on channel 22A. (0% chose this)
Which of the following best describes a shipboard Inmarsat-C system?
-
A small, lightweight terminal capable of providing satellite store-and-forward message communications. (68% chose this)
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A satellite communications system that provides real-time connectivity. (1% chose this)
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A small, lightweight terminal used to transmit messages over high frequency (HF) bands to communicate through a satellite. (6% chose this)
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A satellite communications system that also provides continuous Digital Selective Calling coverage for all ocean regions. (25% chose this)
Which of the following is not correct with regard to Inmarsat-C e-mail?
-
It is possible to send e-mail messages from your ship's Inmarsat-C terminal to any e-mail address in the world. (16% chose this)
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To receive e-mails from shore, your ship's e-mail address must be registered with an Inmarsat C Land Earth Station Service Provider. (4% chose this)
-
An additional hardware upgrade is required to enable your ship's Inmarsat-C terminal to send and receive e-mails. (65% chose this)
-
Not all land earth station service providers support e-mail service. (15% chose this)
Once ARQ communication with the coast radio station has been established, which of the following events will most likely take place?
-
The vessel then requests the coast radio station's SELCAL so that communication can be set up on the appropriate working channel. (12% chose this)
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After exchanging answer-backs (WRU-AAB) with the vessel, the coast radio station transmits GA+?. (68% chose this)
-
Since communication has already shifted to the working channel, the vessel then transmits the subscriber number and text of the message to be sent for the coast radio station to store and forward. (9% chose this)
-
The coast radio station will transmit a menu of commands such as DIRTLX+, OBS+ or AMV+ so the ship can select the desired action. (11% chose this)
What statement is true regarding the exchange between two parties engaged in SITOR (NBDP) communications?
-
In ARQ, each character is transmitted twice, with the second displaced in time from the first. (12% chose this)
-
In ARQ, the "sending" station transmits a block of three characters and the "receiving" station responds with a one character Repeat Request. Following this the "transmitting" station will send a new block. (18% chose this)
-
In ARQ, the ISS transmits a block of 3 characters and the IRS checks for parity. If the received block is correct a one-character control signal is sent notifying the ISS to proceed with the next block. If the parity check fails the block must be resent. (60% chose this)
-
Broadcasts of Maritime Safety Information, traffic lists, etc. can be copied by the receiving station in ARQ mode. (10% chose this)
Which statement best defines the SITOR (NBDP) acronym "ARQ"?
-
Error Correction when 2 stations are in direct & phased telephone communications with each other. (9% chose this)
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Error correction for one-way TELEX transmissions to a single other station. (17% chose this)
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Error correction for one-way TELEX broadcasts of weather or navigation information. (9% chose this)
-
Error Correction with 2 stations are in direct & phased TELEX communications with each other. (65% chose this)
During SITOR (NBDP) ARQ operations through a coast station, what should the GMDSS operator do during the "Automatic Exchange of Answerbacks"?
-
Do nothing other than wait for a GA+? prompt and then issue the desired command. (65% chose this)
-
Send a "WRU" then a "Here is" when requested to do so by the coast station. (13% chose this)
-
Send the necessary message file and then wait for time and charges. (3% chose this)
-
Wait for the coast station to transmit a menu of possible commands and select the desired action. (19% chose this)
A vessel, before transiting the Panama Canal, on a voyage from San Diego to Miami, loses the ability to communicate via Inmarsat. The most likely cause is:
-
The vessel has sailed beyond the coverage area of the Pacific satellite. (67% chose this)
-
The vessel has sailed beyond the coverage area of the Southbury Shore Station. (3% chose this)
-
The vessel has sailed beyond the coverage area of the Western Atlantic satellite. (17% chose this)
-
The satellite orbit is beyond the usable range of the SES. (13% chose this)
Which mode of Inmarsat-B communications may be possible with a lower received signal strength?
-
Fax (14% chose this)
-
Voice Communications (12% chose this)
-
TELEX (68% chose this)
-
Binary computer file transfers (7% chose this)
Which Inmarsat Earth stations could a GMDSS Radio Operator select for routine Inmarsat-C traffic if the vessel is in the Sea of Japan and logged-in to the POR satellite?
-
Beijing (PRC), Santa Paula (USA), Auckland (New Zealand) or Sentosa (Singapore). (71% chose this)
-
Auckland (New Zealand), EIK (Norway), Sentosa (Singapore) or Beijing (PRC). (9% chose this)
-
Yamaguchi (Japan), Southbury (USA), Pune (India) or Haifa (Israel). (17% chose this)
-
Southbury (USA), Thermopylae (Greece), Psary (Poland) or Tangua (Brazil). (3% chose this)
When engaging in voice communications via an Inmarsat-B of F77 terminal, what procedures are used?
-
CODECs are used to digitize the voice signal. (74% chose this)
-
Noise-blanking must be selected by the operator. (3% chose this)
-
The voice signal must be compressed to fit into the allowed bandwidth. (19% chose this)
-
The voice signal will be expanded at the receiving terminal. (4% chose this)
At mid-day in the summer, what would be the best choice in attempting to communicate, using SITOR (NBDP) with a shore station some 1800 miles distant?
-
VHF-FM (3% chose this)
-
Lower HF bands (15% chose this)
-
Higher HF bands (74% chose this)
-
MF (9% chose this)
Which key is used to indicate the end of a selection in a TELEX call via an Inmarsat-B SES?
-
* (3% chose this)
-
ENTER (4% chose this)
-
# (18% chose this)
-
+ (75% chose this)
Through which coast radio station(s) may a U.S.-flag merchant vessel communicate?
-
Any coast radio station in the world that is licensed to provide such communications. (72% chose this)
-
Any coast radio station in the world that is licensed to provide such communications, but prior authorization must be obtained for a U.S.-flag merchant vessel to communicate through a non-U.S. station. (20% chose this)
-
The U.S. Coast Guard coordinates the communications and assigns the working channel. (4% chose this)
-
U.S. flag ships are licensed to communicate only with U.S. coast radio stations. (4% chose this)
Which of the following keystrokes or characters is sent as part of ARQ communications to request a direct TELEX call to a shore-based location?
-
DIRTLX023123456+ (68% chose this)
-
MSG+ (6% chose this)
-
GA+? (23% chose this)
-
ENTER (3% chose this)
Which of the following events will take place immediately after phasing with a Coast Station on an available channel?
-
The ship station begins transmitting the text to the destination telex terminal. (1% chose this)
-
The vessel will request the shore station's answerback to confirm it has reached the correct station. (8% chose this)
-
The ship will transmit the desired command (such as DIRTLX+, OBS+ or AMV+) to the coast radio station. (17% chose this)
-
After exchanging answer-backs (WRU/AAB) the coast station transmits GA+? and awaits a command. (73% chose this)
How can a GMDSS operator determine the best frequency band to choose for a SITOR (NBDP) transmission to a shore station?
-
By consulting propagation tables. (13% chose this)
-
Listen to shore station "free signals" and choose the band with the strongest signal. (72% chose this)
-
If static interference is present, try lower bands first. (4% chose this)
-
During nighttime, choose higher frequencies. Choose lower frequencies in the daytime. (11% chose this)
Which statement best describes amplitude modulation?
-
The character data from the terminal is changed to audio tones. (0% chose this)
-
The frequency is varied in synchronization with the modulating signal. (10% chose this)
-
The amplitudes in the sideband(s) changes but the radio carrier frequency remains constant. (63% chose this)
-
The amplitude of the carrier is changed but there is still only a single frequency being transmitted. (27% chose this)
What is an "Inmarsat Mobile Number"?
-
This identifies the vessel's selective calling (SELCAL) number. (14% chose this)
-
This is the Inmarsat number that is assigned to a unit for incoming or outgoing calls. (75% chose this)
-
This is the vessel's Inmarsat registration number for accounting authority purposes. (6% chose this)
-
This number is used for receiving news and other optional services in FleetNETTM. (4% chose this)
When placing a TELEX call to a Coast Station, you should always:
-
Choose the closest station. (13% chose this)
-
Tune the transmitter on another frequency. (2% chose this)
-
Wait until the coast station sends his traffic list. (0% chose this)
-
Make sure the frequency is not occupied with normal traffic. (85% chose this)
To ensure effective HF communications, GMDSS operators should:
-
Employ the short rules of propagation selection or rely on previous successful communications as a guide. (75% chose this)
-
Disregard the short rules of propagation selection and try different bands until one works. (3% chose this)
-
Do not rely on previous successful communications on the selected frequency band - the ionosphere changes too rapidly and inconsistently. (13% chose this)
-
Rely on the equipment calculations of Optimum Usable Frequency. (10% chose this)
In what way(s) may a Distress message be initiated through Inmarsat?
-
By transmitting the Distress message on the U.S. Coast Guard's dedicated monitoring channel. (1% chose this)
-
By adding the word "Distress" in the first line of the message's preamble. (3% chose this)
-
All Inmarsat units must use a dedicated key that can be pressed for immediate action. (20% chose this)
-
By pressing dedicated key(s) for this purpose or using menu-driven features to produce a Distress priority message. (76% chose this)
The "short rules" of propagation necessary to select the appropriate frequency band are:
-
Shorter distance = Higher Frequency, Daytime = Higher Frequency. (15% chose this)
-
Shorter distance = Lower Frequency, Daytime = Higher Frequency. (72% chose this)
-
Shorter distance = Higher Frequency, Daytime = Lower Frequency. (5% chose this)
-
Shorter distance = Lower Frequency, Daytime = Lower Frequency. (8% chose this)
In ARQ, when the information sending station (ISS) receives a signal that the parity check failed what happens?
-
The next block will be sent. (7% chose this)
-
The data link will break. (10% chose this)
-
The acknowledge light should illuminate. (10% chose this)
-
The last block will be resent. (74% chose this)
With an Inmarsat-C LES, how are messages routed to receiving stations?
-
All messages are forwarded via a store and forward network. (71% chose this)
-
Direct connections are made to the receiving stations via gateways. (4% chose this)
-
Intermediary stations are used to connect the sending station with the receiving station in a real-time mode. (10% chose this)
-
Messages are stored until the network is polled by the receiving station. (15% chose this)
What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?
-
Relocate the mast or other obstruction. (8% chose this)
-
Raise the transmit power level. (8% chose this)
-
Change the ship's course. (77% chose this)
-
Increase the receiver gain. (6% chose this)
What will cause an individual battery cell to reverse polarity.
-
High discharge rates without allowing for a cool down period. (6% chose this)
-
When discharging the battery string if a cell becomes weaker than the remaining cells, the discharge current will effectively charge the weaker cell in reverse polarity. (80% chose this)
-
Insufficient charging which does not bring all of the cells up to full charge. (10% chose this)
-
The charging circuits are connected in the correct polarity but all of the cells are equally charged. (4% chose this)
At mid-night, what would be the best choice in attempting to communicate, using SITOR (NBDP) with a shore station some 800 miles distant?
-
VHF-FM (3% chose this)
-
Higher UHF bands (6% chose this)
-
Communications are impossible at this distance. (8% chose this)
-
HF bands (83% chose this)
Which of the following modes of communications are available when using Inmarsat-C?
-
Fax reception (7% chose this)
-
TELEX and e-mail (81% chose this)
-
14400 BPS Data (1% chose this)
-
Voice transmissions (10% chose this)
Which functions may the holder of a GMDSS Radio Operator License not perform on the Inmarsat-C equipment?
-
Selection of LES for routine traffic. (3% chose this)
-
Maintain the antenna clear of soot, paint, etc. (9% chose this)
-
Adjust the azimuth and elevation values. (83% chose this)
-
Logon, traffic and logoff functions. (5% chose this)
What statement is true regarding Inmarsat-C?
-
There is a propagation delay, but a direct connection is made between the ship and shore users. (8% chose this)
-
There are delays in establishing communications. Then a direct real-time connection is maintained with the other party. (8% chose this)
-
The TELEX message is stored until the mailbox is accessed by the station desiring to retrieve their message. (12% chose this)
-
This is a store and forward network, with an intermediate step that means there is no direct connection between ship and shore users. (73% chose this)
Which of the following conditions does not typically impair Inmarsat-B communications ?
-
An obstruction, such as a mast, blocking the signal between the satellite and the SES antenna when the vessel is steering a specific course. (16% chose this)
-
Normal precipitation from gales and storms. (73% chose this)
-
A satellite whose signal is on a low elevation, below the horizon. (6% chose this)
-
Travel beyond the effective radius of the satellite. (5% chose this)
An incoming DSC Distress alert on 8414.5 kHz will have what result?
-
The DSC controller will emit both an audible and visual alarm. (14% chose this)
-
The particulars of the alert may be printed out. (3% chose this)
-
The Distress information contained in the alert will be sent to the data directory. (3% chose this)
-
All of these answers would typically occur. (80% chose this)
How may an Inmarsat-C unit be used to send text communications to an Internet destination?
-
Call up the file menu, insert the internet address in the first line of the file and use the SEND/REC or TRANSMIT menu to send the message. (10% chose this)
-
Use the SEND/REC or TRANSMIT menu, compose a text file and use the file attach function in the file menu. (6% chose this)
-
Internet addresses cannot be reached from an Inmarsat-C terminal without a separate e-mail computer. (4% chose this)
-
Compose a text file, use the SEND/REC or TRANSMIT menu & specify the recipient using the address book function (or by manual entry) for e-mail. (80% chose this)
Which of the following statements concerning Inmarsat geostationary satellites is true?
-
They are in a polar orbit, in order to provide true global coverage. (7% chose this)
-
They provide coverage to vessels in nearly all of the world's navigable waters. (76% chose this)
-
They are in an equatorial orbit, in order to provide true global coverage. (9% chose this)
-
Vessels sailing in equatorial waters are able to use only one satellite, whereas other vessels are able to choose between at least two satellites. (8% chose this)
Which of the following is utilized to transmit Enhanced Group Calls?
-
COSPAS satellite (4% chose this)
-
HF SITOR (NBDP) shore stations (15% chose this)
-
NAVTEX shore stations (5% chose this)
-
Inmarsat satellite (76% chose this)
The Distress Alarm sounds and the screen readout no longer contains the particulars of the Distress:
-
The particulars are rarely routed to the printer so it is of no use to examine the printer. (1% chose this)
-
Examine the Transmitted Data Directory or the printer to recover the information. (24% chose this)
-
Call the Distress vessel on the DSC frequency and request a retransmission. (3% chose this)
-
Examine the Received Data Directory or the printer to recover the information. (73% chose this)
Which functions may the holder of a GMDSS Radio Operator License NOT perform on the Inmarsat-C equipment?
-
Maintain the antenna clear of soot, paint, etc. (3% chose this)
-
Log-on, traffic and log-off functions. (3% chose this)
-
Entry of position data and selection of LES. (6% chose this)
-
Optimize performance by adjusting the transmitter EIRP. (88% chose this)
What are the directional characteristics of the Inmarsat-C SES antenna?
-
Highly directional parabolic antenna requiring stabilization. (8% chose this)
-
Omni-directional. (89% chose this)
-
Wide beam width in a cardioid pattern off the front of the antenna. (2% chose this)
-
Very narrow beam width straight-up from the top of the antenna. (2% chose this)
Which Inmarsat Earth Stations could a vessel utilize for Inmarsat-B traffic if operating off the Pacific Coast of the United States and tracking the POR satellite?
-
Lakhdaria (Algeria), Yamaguchi (Japan) or Sentosa (Singapore). (4% chose this)
-
Southbury (USA), Burum (Netherlands), EIK (Norway). (14% chose this)
-
Kumsan (South Korea), Burum (Netherlands), or Nakhoda (Russia). (1% chose this)
-
Santa Paula (USA), Auckland (New Zealand) or Yamaguchi (Japan). (81% chose this)
What is the purpose of a CODEC?
-
Noise and echo-canceling used in TELEX operation. (3% chose this)
-
To enable Distress communications. (0% chose this)
-
To enable data communications. (15% chose this)
-
To convert analog voice signals to digital transmissions. (82% chose this)
How would a notification of arrival be sent as a text to a mobile phone number using an Inmarsat-C unit?
-
Mobile phone numbers cannot be reached by Inmarsat-C terminals because they lack voice capability. (11% chose this)
-
Use the Inmarsat-C voice handset to compose and transmit the text. (4% chose this)
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Compose a text file, use the SEND/REC or TRANSMIT menu & specify the recipient using the address book function (or by manual entry) for SMS destinations. (81% chose this)
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The mobile phone number is inserted as the first line of the text file and sent with the SEND/REC or TRANSMIT menu. (4% chose this)
Which of these can take place on an Inmarsat-C terminal that has synch with the NCS CC but has not yet performed a successful login?
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Reception of unscheduled MSI Urgency and Distress messages. (84% chose this)
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Transmission of synoptic weather reports and company traffic. (1% chose this)
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Reception of the mandatory scheduled BALD MSI messages. (11% chose this)
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Reception of company traffic related to ship's business. (3% chose this)
Which of the following methods will give a GMDSS Radio Operator the best indication of whether ARQ communication can be established with a coast radio station?
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Referring to propagation charts will tell the Operator when the eruption of communication shattering solar flares will occur. (4% chose this)
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Selecting a frequency in the MF band averts interference from severe static discharges. (6% chose this)
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Monitor the coast radio station's "free signals" and call on the frequency on which the loudest and most consistent signals are heard. (88% chose this)
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Re-position the antenna toward the coast radio station and press the "call request" button. (1% chose this)
What action should be taken on changing from one ocean region to another?
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Power the system down and turn the power back on again. (3% chose this)
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Manually realign the antenna. (1% chose this)
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Log out of the current satellite and log in to the correct satellite. (85% chose this)
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No action is required -- the unit will scan for another satellite and log in. (11% chose this)
When logging into the Inmarsat system using Inmarsat-C, it is necessary to:
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Enter your IMN. (6% chose this)
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Select the Ocean Region. (85% chose this)
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Enter the LES answer back. (4% chose this)
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Call the LES and inform them that you are now operating in the appropriate ocean region. (6% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 440122 in the United Kingdom (TELEX country code 51)?
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51440122+ (16% chose this)
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(51)440122 (1% chose this)
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51440122 (79% chose this)
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51440122# (4% chose this)
Which mode of communication is possible through an Inmarsat-C SES?
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SITOR (NBDP) (8% chose this)
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Radiotelephone (3% chose this)
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TELEX and e-mail (85% chose this)
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DSC (4% chose this)
What can be the visual observation of a condition whereby it may be possible to initiate a reliable Inmarsat TELEX transmission but a voice transmission may not be possible?
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An indication on a meter or on the display terminal of high transmit power. (10% chose this)
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An indication on a meter or on the terminal of low receiver signal strength. (77% chose this)
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An indication of a very high antenna elevation on the display terminal screen. (7% chose this)
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An indication that the antenna has reached its maximum travel in one direction. (6% chose this)
What is the effect of having five periods (e.g. .....) in the text of a TELEX transmission on an Inmarsat-B SES?
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The transmission will automatically terminate after those characters are transmitted. (80% chose this)
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Only the first period will be routed to the receiving party. (8% chose this)
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Only the first two periods will be routed to the receiving party. (3% chose this)
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This will automatically trigger the reversal of charges to the receiving party. (10% chose this)
To keep the Inmarsat-B or F77 antenna pointing at the desired satellite, regardless of the ship's position and course, it has an input from the vessel's:
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Operational radar (3% chose this)
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Automated Radar Plotting Aid (ARPA equipped radar) (8% chose this)
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Steering control system (1% chose this)
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Gyrocompass (88% chose this)
What menu function in Inmarsat-C terminals would typically be used to specify an Internet address destination?
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The System Setup menu to store all required e-mail destinations. (4% chose this)
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The Address book function (or manual entry) in the SEND/REC or TRANSMIT menu. (88% chose this)
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The Data Report menu to initiate the SEND/REC or TRANSMIT process. (7% chose this)
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The menus for File Operations are used for adding the Internet address to the file. (1% chose this)
Which statement is correct regarding a method that a vessel experiencing problems with shadowing of an Inmarsat-B (or F77) SES antenna by an on-board obstruction could use to attempt reliable communications?
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Change course to remove the shadow. (89% chose this)
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Change the Coast Station ID programming. (4% chose this)
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Install a shadow correction filter. (1% chose this)
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Switch from TELEX to voice mode. (5% chose this)
GMDSS operators should routinely focus on the factors affecting propagation in what priority?
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Distance & time of day, seasonal variations, sunspot cycle, solar flare alerts. (84% chose this)
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Sunspot cycle, distance & time of day, seasonal variations, solar flare alerts. (4% chose this)
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Solar flare alerts, distance & time of day, sunspot cycle, seasonal variations. (4% chose this)
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Solar flare alerts, sunspot cycle, seasonal variations, distance & time of day. (8% chose this)
Which of the following best describes Inmarsat-C operation?
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Is an analog-based system. (4% chose this)
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Requires a stabilized directional antenna. (5% chose this)
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Provides for voice, TELEX, high and low-speed data and compressed video communications. (8% chose this)
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Is a digital store-and-forward system that also provides Enhanced Group Call, data reporting, polling and Distress alerting capabilities. (84% chose this)
Messages are transmitted by an Inmarsat LES according to what criteria?
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First In, First Out (8% chose this)
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Priority (89% chose this)
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Last In, First Out (1% chose this)
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Serial Number (1% chose this)
What does the term "ARQ" mean in SITOR (NBDP) operations?
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Automation Repeat Request (7% chose this)
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Automaton Repeat Request (0% chose this)
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Automatic Repeat Request (81% chose this)
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Automatic Request Repeat (12% chose this)
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number (045) 334-5678 in Japan (voice country code 81)?
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810453345678# (10% chose this)
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810453345678 (84% chose this)
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81(045)3345678 (4% chose this)
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81 (045) 334-5678 (2% chose this)
How is an Inmarsat Distress priority message ordinarily initiated on board the vessel?
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By pressing one or more dedicated "Distress key" controls on the equipment. (93% chose this)
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By dialing the correct code on the telephone remote unit. (1% chose this)
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By contacting the LES operator and announcing a Distress condition is in progress. (4% chose this)
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By contacting the LES operator using the radiotelephone Distress procedure "Mayday"... etc. (1% chose this)
Which Inmarsat Earth stations would be available for Inmarsat-B traffic if the vessel is off the Atlantic Coast of the United States and tracking the AOR-E satellite?
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Fucino (Italy), Thermopylae (Greece) or Haiphong (Vietnam). (3% chose this)
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Santa Paula (USA), Beijing (PRC), Sentosa (Singapore). (6% chose this)
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Southbury (USA), Burum (Netherlands), or EIK (Norway). (89% chose this)
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Haiphong (Vietnam), Burum (Netherlands), or EIK (Norway). (3% chose this)
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