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
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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
A.elevation
B.magnetic angle
C.vertical angle
D.dip
A.divisional parts
B.coefficients
C.fractional parts
D.equations
最新試題
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
Which statement about the gyrocompass is FALSE（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
When changing from a compass course to a true course you should apply（）.
What is an advantage of the magnetic compass aboard vessels?（）
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
Variation in a compass is caused by（）.
The quadrantal spheres are used to（）.