单项选择题

A radar display in which North is always at the top of the screen is a(n)（）.

A.unstabilized display
B.stabilized display
C.composition display
D.relative display

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单项选择题

A radar contact will remain stationary on a relative motion radar display only when it is（）.

A.on the same course as your vessel
B.at the same speed as your vessel
C.on the same course and speed as your vessel
D.on a reciprocal course at the same speed as your vessel

单项选择题

A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines（）.

A.Separated line
B.Divided line
C.Reference line
D.Segregated line

单项选择题

A Doppler speed log indicates speed over ground（）.

A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current