A.alerting
B.on-scene communication
C.safety information
D.general communication
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A.sometimes
B.all times
C.never
D.partly
A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power
A.from any INMARSAT satellite
B.via any appropriate Navtex and EGC station
C.via the satellite the MES is tracking
D.from any RCC and coast station
A.four
B.six
C.five
D.three
A.selective and can be suppressed by ships
B.mandatory and can not be suppressed by ships in the affected area
C.not very important so that ships don‟t require them
D.received by all ships wherever they are
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Radio communication()for many years and helps to save tens of thousands of lives.
By using()system a ship can send a distress message and know with certainty it will be received.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?()
For COSPAS-SARSAT system,()usually transmit initial COSPAS-SARSAT alert.
The quality of EGC messages is()affected by the position of the ship, the time of reception and climatic conditions.
On-scene communications will normally take place between().
As each MSI message will have a unique identity, the printing of messages already received correctly is().
Before GMDSS, if the radio officer on board is serious ill,().
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous()alert.
()by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.