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單項選擇題

（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.

A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacom
D.Digital selective calling

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單項選擇題

（）provides a paper trace of course steered by the vessel against time.

A.The echo sounder
B.The radar
C.The course recorder
D.The direction finder

單項選擇題

（）is a radio receiver with ablity to sense direction of the incoming radio waves.

A.The echo sounder
B.The radar
C.The course recorder
D.The direction finder

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