单项选择题
The Flinders bar on a magnetic compass compensates for the（）.
A.induced magnetism in vertical soft iron
B.induced magnetism in horizontal soft iron
C.permanent magnetism in ship's steel
D.vessel's inclination from the vertical
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相关考题
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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 -
单项选择题
The directive force of a gyrocompass（）.
A.increases with latitude，being maximum at the geographic poles
B.decreases with latitude，being maximum at the geographic equator
C.is greatest when a vessel is near the Earth's magnetic equator
D.remains the same at all latitudes -
单项选择题
The difference between magnetic heading and compass heading is called（）.
A.variation
B.deviation
C.compass error
D.drift
