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
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
When crossing the magnetic equator the（）.
The quadrantal spheres are used to（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
By convention，the north seeking ends of a compass’ magnets are colored（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
This induced magnetism（）the permanent magnetism already present in the ship.