单项选择题
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
The compass heading of a vessel differs from the true h...
单项选择题The compass heading of a vessel differs from the true heading by（）.
A.compass error B.variation C.magnetic dip D.deviation
The compass error of a magnetic compass that has no dev...
单项选择题The compass error of a magnetic compass that has no deviation is（）.
A.zero B.equal to variation C.eliminated by adjusting the compass D.constant at any geographical location
