单项选择题
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
A.Quadrantal spheres
B.Heeling magnets
C.Athwartships magnets
D.Fore-and-aft magnets
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相关考题
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单项选择题
Variation is the angular measurement between（）.
A.compass north and magnetic north
B.compass north and true north
C.magnetic meridian and the geographic meridian
D.your vessel's heading and the magnetic meridian -
单项选择题
Variation is a compass error that you（）.
A.can correct by adjusting the compass card
B.can correct by adjusting the compensating magnets
C.can correct by changing the vessel's heading
D.cannot correct -
单项选择题
Variation in a compass is caused by（）.
A.worn gears in the compass housing
B.magnetism from the earth's magnetic field
C.magnetism within the vessel
D.lack of oil in the compass bearings
