单项选择题

The error in a magnetic compass caused by the vessel’s magnetism is called（）.

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

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单项选择题The compass heading of a vessel differs from the true heading by（）.

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磁罗经与陀螺罗经的使用

The error in a magnetic compass caused by the vessel’s magnetism is called（）.