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Subel. D
6 questions
Subelement D

Distress, Urgency & Safety Comms:

Section 21

Distress Relays:

A DSC Distress Relay should always be made under the following circumstances:

  • Correct Answer
    When a DSC response to a Distress alert from a Coast/Ship Station hasn't been received and the Master approves.
  • When the MMSI of the vessel in Distress cannot be determined.
  • After there is an acknowledgement from a coast station.
  • DSC Distress Relays do not need to be made if your vessel is too far away to assist.
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Your ship received a Distress relay from a coast station on DSC VHF channel 70. What action should the watch officer take?

  • Retransmit the DSC call on Ch-70 to other vessels in the vicinity.
  • Correct Answer
    Monitor Ch-16 to determine if there are any genuine Distress communications.
  • Monitor Ch-06 to determine if there are any genuine Distress communications.
  • Transmit a voice "Mayday Relay" call on Ch-13.
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Under what condition would you not relay a DSC Distress alert?

  • If the mobile unit in Distress is incapable of further Distress alert communications.
  • If no Coast Station/Mobile Unit acknowledgement of the alert is observed.
  • Correct Answer
    A coast station DSC acknowledgment of the original Distress alert was received by your vessel.
  • No distress traffic has been heard and the DSC alert is unacknowledged via DSC.
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The relay of DSC Distress alerts:

  • Was not originally an intended function of the GMDSS system but now is the preferred method to notify an RCC.
  • Remains the preferred method for passing Distress message traffic to an RCC or Coast Station.
  • Should always be done immediately to ensure a Coast Station receives the DSC Distress Alert.
  • Correct Answer
    Can quickly overburden the GMDSS systems in the vicinity with improperly transmitted or inappropriately relayed DSC calls.
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Transmission of a Distress alert by a station on behalf of another vessel actually in Distress should not occur:

  • Correct Answer
    When communications between the Distress vessel and a Coast station are already in progress.
  • When the mobile unit actually in Distress is not itself in a position to transmit the Distress alert.
  • When the Master or responsible person on the mobile unit not in Distress so decides.
  • When the responsible person at the Coast Station determines further help is necessary.
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You are in voice communication on Ch-16 with a vessel in Distress that advises you they are unable to contact a Coast Station. What action would you take?

  • Send a DSC Distress Relay transmission on Ch-16.
  • Correct Answer
    Attempt to contact a Coast Station using voice on Ch-16 with a Mayday Relay.
  • Make an all ships call with Urgency priority.
  • Call the Coast Station on Ch-70 with Distress priority giving the other vessel's position.
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