7-A-034: Radio silence & resumption of normal traffic
7-34E1:
What is the fundamental purpose for imposing radio silence?
To mitigate the risk of interference on a frequency or channel being used for emergency communications.
To ensure that interference to proprietary communications is minimized.
To ensure that only voice communications can be effected on the Distress frequency or channel.
To ensure that a Distressed vessel will have a "window" twice each hour for transmitting routine messages.
7-34E2:
When can routine communications be resumed when radio silence has been imposed?
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.
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.
7-34E3:
What is meant by the term "Seelonce Mayday"?
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.
7-34E4:
How is "radio silence" imposed?
By the On Scene Coordinator (OSC) or the RCC chosen by the SAR Mission Coordinator.
By the Land Earth Station (LES) controlling the Distress communications on that frequency.
By the nearest Public Correspondence Coast Station.
By the vessel first responding to the Distress call.
7-34E5:
How are normal working conditions restored on a SITOR (NBDP) frequency on which radio silence had been imposed?
The RCC or Coast station that imposed the radio silence must transmit a SITOR (NBDP) message stating "SILENCE FINI".
The LES that imposed the radio silence must transmit a SITOR (NBDP) message stating "SILENCE FINI".
The Public Correspondence Station (PCS) that imposed the radio silence must transmit a narrow band direct printing message on the Distress frequency stating "SILENCE FINI".
The High Seas Service (HSS) that imposed the radio silence must transmit a narrow band direct printing message on the Distress frequency stating "SILENCE FINI".
7-34E6:
How are normal working conditions restored after radio silence has been imposed?
The Rescue Coordination Center (RCC) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SEELONCE FEENEE".
All of these answers are correct.
The Land Earth Station (CES) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SILENCE FINI".
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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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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