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單項選擇題

The information flow of the MSI broadcast must be controlled（）.

A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power

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單項選擇題

If EGC receiver shares a same antenna with INMARSAT MES, it means that it can receive MSI（）.

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

單項選擇題

EGC safetyNet transmits（）types of messages for mariners.

A.four
B.six
C.five
D.three

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