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單項選擇題

（）means a technique using digital codes which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.

A.DSC
B.MSI
C.EGC
D.NBDP

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單項選擇題

（）means navigational and meteorological warnings, meteorological forecasts and other urgent related messages broadcast to ships.

A.Navigational broadcast
B.weather forecast
C.Urgency message
D.Maritime Safety Information

單項選擇題

（）is designed to send an automatic distress alert when a ship sinks suddenly.

A.Lifeboat
B.A survival craft
C.An EPIRB
D.A SART

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