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
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Variation in a compass is caused by（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When a magnetic compass is not in use for a prolonged period of time it should（）.
The most accurate method of determining gyrocompass error while underway is by（）.
Which compensates for errors introduced when the vessel heels over（）.
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.