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（）.
Variation is a compass error that you（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
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.
A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°.Which action should be taken to remove this error during compass adjustment（）.
The Flinders bar on a magnetic compass compensates for the（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.