A.needles are nearly in line with the meridian
B.vessel is near the magnetic poles
C.variation is near zero
D.vessel is near the magnetic equator
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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
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
最新試題
When crossing the magnetic equator the（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The quadrantal spheres are used to（）.
When relieving the helm，the new helmsman should know the（）.
Which statement about the gyrocompass is FALSE（）.
What is an advantage of the magnetic compass aboard vessels?（）
This induced magnetism（）the permanent magnetism already present in the ship.
The most accurate method of determining gyrocompass error while underway is by（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.