单项选择题

The lubber’s line on a magnetic compass indicates（）.

A.compass north
B.the direction of the vessel's head
C.magnetic north
D.a relative bearing taken with an azimuth circle

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单项选择题

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

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