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Subel. D
6 questions
Subelement D

Distress, Urgency & Safety Comms:

Section 23

Radio Silence & Resumption of Traffic:

What is the fundamental purpose for imposing radio silence?

  • To ensure that interference to proprietary communications is minimized.
  • To ensure that only voice communications can be effected on the Distress frequency or channel.
  • Correct Answer
    To mitigate the risk of interference on a frequency or channel being used for emergency communications.
  • To ensure that a Distressed vessel will have a "window" twice each hour for transmitting routine messages.
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When can routine communications be resumed when radio silence has been imposed?

  • After determining that the frequency or channel appears to be no longer in use.
  • After determining that geographic distance from the Distress situation will prohibit any other signal from interfering with emergency communications.
  • If, in the master's opinion, communications on that frequency will interfere with emergency communications.
  • Correct Answer
    Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded.
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What is meant by the term "Seelonce Mayday"?

  • Correct Answer
    Stations not directly involved with the on-going Distress communications may not transmit on the Distress frequency or channel.
  • Stations remaining off the air to safeguard proprietary information.
  • Two three-minute silent periods, at 15 and 45 minutes after the hour, that provide a transmitting "window" for distressed vessels to transmit Distress alerts using J3E.
  • Communications on a Distress frequency or channel is banned for 24 hours following the cessation of the Distress traffic.
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How is "radio silence" imposed?

  • By the Land Earth Station (LES) controlling the Distress communications on that frequency.
  • Correct Answer
    By the On Scene Coordinator (OSC) or the RCC chosen by the SAR Mission Coordinator.
  • By the nearest Public Correspondence Coast Station.
  • By the vessel first responding to the Distress call.
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What is the reason for imposing radio silence?

  • To keep a clear channel open for Safety broadcasts.
  • Correct Answer
    To prevent interference to Distress communications.
  • To allow individual vessels to carry out direct communications.
  • To listen periodically for other vessels sending Distress alerts on Ch-70.
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How are normal working conditions restored after radio silence has been imposed?

  • All of these answers are correct.
  • The Land Earth Station (LES) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SILENCE FINI".
  • Correct Answer
    The Rescue Coordination Center (RCC) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SEELONCE FEENEE".
  • The Public Correspondence Station (PCS) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SILENCE FINI".
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