单项选择题

Magnetic variation changes with a change in（）.

A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position

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单项选择题

Magnetic heading differs from compass heading by（）.

A.compass error
B.true heading
C.variation
D.deviation

单项选择题

Magnetic dip is a measurement of the angle between the（）.

A.geographic pole and the magnetic pole
B.lubber's line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading