A.compass north and magnetic north
B.compass north and true north
C.magnetic meridian and the geographic meridian
D.your vessel's heading and the magnetic meridian
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A.can correct by adjusting the compass card
B.can correct by adjusting the compensating magnets
C.can correct by changing the vessel's heading
D.cannot correct
A.worn gears in the compass housing
B.magnetism from the earth's magnetic field
C.magnetism within the vessel
D.lack of oil in the compass bearings
A.deviation
B.variation
C.compass error
D.northerly error
A.the compass heading is in line with the lubber's line
B.there is no lost motion in the gimbal rings
C.no change of heading by compass is observed if you raise and lower the heeling magnet
D.the gimbal rings do not strike the compass frame when they are tilted
A.The Flinders bar
B.The heeling magnet
C.Quadrantal soft iron spheres
D.Bar magnets in the binnacle
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（）.
What is an advantage of the magnetic compass aboard vessels?（）
Variation in a compass is caused by（）.
Variation is the angular measurement between（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
When relieving the helm，the new helmsman should know the（）.
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.