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
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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
A.elevation
B.magnetic angle
C.vertical angle
D.dip
最新試題
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
Which statement about the gyrocompass is FALSE（）.
What is an advantage of the magnetic compass aboard vessels?（）
What is the name of the movable，radial guide line used to measure direction on a radar?（）
This induced magnetism（）the permanent magnetism already present in the ship.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Variation in a compass is caused by（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
When relieving the helm，the new helmsman should know the（）.