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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单项选择题

A.deviation
B.variation
C.compass error
D.dip

单项选择题

A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error

单项选择题

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