A.compass error
B.variation
C.magnetic dip
D.deviation
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A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
A.geographical position
B.speed
C.heading
D.longitude
A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings
A.induced magnetism in the vessel's horizontal soft iron
B.change in the magnetic field when the vessel inclines from vertical
C.permanent magnetism of the vessel
D.magnetic fields caused by electrical currents in the vicinity
A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position
最新試題
When relieving the helm，the new helmsman should know the（）.
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（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
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.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
This induced magnetism（）the permanent magnetism already present in the ship.