單項(xiàng)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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1.單項(xiàng)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
2.單項(xiàng)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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