单项选择题
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
The error in a magnetic compass caused by the vessel’s ...
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
The directive force of a gyrocompass（）.A.increases with...
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
The difference between magnetic heading and compass hea...
单项选择题The difference between magnetic heading and compass heading is called（）.
A.variation B.deviation C.compass error D.drift
