单项选择题

（）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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单项选择题

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

单项选择题

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

单项选择题

A.The marine sextant
B.The chronometer
C.The echo sounder
D.The radar