A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
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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
A.compass error
B.true heading
C.variation
D.deviation
最新試題
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
When relieving the helm，the new helmsman should know the（）.
The quadrantal spheres are used to（）.
This induced magnetism（）the permanent magnetism already present in the ship.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Variation is the angular measurement between（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
When changing from a compass course to a true course you should apply（）.
Variation in a compass is caused by（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.