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
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.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When changing from a compass course to a true course you should apply（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
The line which connects the points of zero magnetic dip is（）.
The most accurate method of determining gyrocompass error while underway is by（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
When relieving the helm，the new helmsman should know the（）.
Variation in a compass is caused by（）.