單項選擇題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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1.單項選擇題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

3.單項選擇題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

4.單項選擇題A Doppler log in the volume reverberation mode indicates（）.

A.speed being made good
B.speed through the water
C.the set of the current
D.the depth of the water

5.單項選擇題A Doppler log in the bottom return mode indicates the（）.

A.velocity of the current
B.bottom characteristics
C.depth of the water
D.speed over the ground