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Subel. C
6 questions
Subelement C

DSC & Alpha-Numeric ID Systems:

Section 18

Sending a Distress Alert:

A VHF-DSC "Distress Hot Key" alert always transmits what information if connected to GPS?

  • Distress designation and follow on communications channel.
  • A "Nature of Distress" category and Distress priority specifier code.
  • Position, UTC time of position update and Ch-70 for voice follow-on.
  • Correct Answer
    Position, time of position update, MMSI number programmed and Distress priority specifier.
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Which of the following statements is true regarding Distress alerting under GMDSS?

  • Correct Answer
    The Distress alert must identify the station in Distress and its position and may additionally include information regarding the nature of the Distress.
  • Ship to shore Distress alerts are used to alert other ships in port of navigational hazards.
  • Ship-to-ship Distress alerts are used to alert other ships in the vicinity of navigational hazards and bad weather.
  • The vessel nearest to the emergency must notify the Coast Guard before leaving the vicinity.
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If a GMDSS Radio Operator initiates a DSC Distress transmission but does not insert a message, what happens?

  • The transmission is aborted and an alarm sounds to indicate this data must be provided by the operator.
  • Correct Answer
    The transmission will be made with "default" information provided automatically.
  • The transmission is not initiated and "ERROR" is indicated on the display readout.
  • The receiving station will poll the DSC unit of the vessel in Distress to download the necessary information.
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Repetition of a DSC Distress call is normally automatic if not acknowledged after a delay of:

  • 2 - 5 minutes
  • 10-15 minutes
  • Correct Answer
    3.5 - 4.5 minutes
  • 1 - 2 minutes
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A VHF-DSC Distress alert call:

  • Using the "Distress Button" or "Distress Hot Key" ensures that all information pertinent to a Distress will be transmitted.
  • Contains information on the vessel's course and speed.
  • Correct Answer
    Can include the nature of the distress if time permits and operator selects it
  • Will always contain accurate positions from GPS units and correct MMSI numbers.
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A VHF-DSC Distress alert will always be transmitted on what channel?

  • Ch-16
  • Ch-22A
  • Ch-6
  • Correct Answer
    Ch-70
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