A.Quadrantal spheres
B.Heeling magnets
C.Athwartships magnets
D.Fore-and-aft magnets
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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
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
最新試題
Variation in a compass is caused by（）.
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 is the basic principle of the magnetic compass?（）
What is the name of the movable，radial guide line used to measure direction on a radar?（）
Which statement about the gyrocompass is FALSE（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
The most accurate method of determining gyrocompass error while underway is by（）.
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（）.
While in drydock your vessel will be belt-gauged.This process involves（）.