A.After determining that the frequency or channel appears to be no longer in use
B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C.After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
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A.10 minutes
B.1 minute
C.1 hour
D.3 minutes
A.To ensure that interference to proprietary communications is minimized
B.To ensure that only voice communications can be effected on the distress frequency or channel
C.To ensure that a distressed vessel will have a "window" twice each hour for transmitting routine messages
D.To ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized
A.1492 kHz
B.1892 kHz
C.2082 kHz
D.2182 kHz
A.Red flares or red rockets
B.Continuous sounding of fog signaling apparatus
C.International Code Flags "November" and "Charlie"
D.Basket hanging in the rigging
A.Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel
B.Stations remaining off the air to safeguard proprietary information
C.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
D.Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
最新試題
The Navigation Rules state that a vessel shall be operated at a safe speed at all times so that she can be stopped within（）.
The distress message of a ship should include considerable information which might facilitate the rescue. This information should（）.
Which signal is detected as originating from a SART?（）
Which condition represents the appropriate time for setting off distress flares and rockets? （）
How is “radio silence” imposed?（）
Which is a distress signal? （）
What is NOT a distress signal?（）
Upon receipt of a distress message，a merchant vessel is bound to proceed to the scene of the distress. Under which of the following cases would this NOT be true?（）
When should distress flares and rockets be used? （）
When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.