A.Compass error is negligible at or near the earth's magnetic poles
B.It does not have to be checked as often
C.It is reliable due to it's essential simplicity
D.All points on the compass rose are readily visible
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A.Quadrantal spheres
B.Heeling magnets
C.Athwartships magnets
D.Fore-and-aft magnets
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
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
最新試題
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
The quadrantal spheres are used to（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
When changing from a compass course to a true course you should apply（）.
What is the basic principle of the magnetic compass（）.
Variation is the angular measurement between（）.
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（）.