单项选择题
The lubber’s line of a magnetic compass（）.
A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card
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相关考题
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单项选择题
The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is（）.
A.deviation
B.variation
C.compass error
D.dip -
单项选择题
The gyrocompass error resulting from your vessel’s movement in OTHER than an east-west direction is called（）.
A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error -
单项选择题
The greatest directive force is exerted on the magnetic compass when the（）.
A.needles are nearly in line with the meridian
B.vessel is near the magnetic poles
C.variation is near zero
D.vessel is near the magnetic equator
