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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A.variation
B.deviation
C.compass error
D.bearing error
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
A.variation
B.deviation
C.compass error
D.drift
A.compass error
B.variation
C.magnetic dip
D.deviation
A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
最新試題
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
When changing from a compass course to a true course you should apply（）.
When relieving the helm，the new helmsman should know the（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
What is the basic principle of the magnetic compass（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Variation is a compass error that you（）.
Which statement about the gyrocompass is FALSE（）.