A.be shielded from direct sunlight
B.be locked into a constant heading
C.have any air bubbles replaced with nitrogen
D.have the compensating magnets removed
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A.Compass rose
B.Cursor
C.Plan position indicator
D.Variable range marker
A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle(s) will，when properly compensated，lie parallel to the isogonic lines of the Earth
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
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
最新試題
When relieving the helm，the new helmsman should know the（）.
Variation is the angular measurement between（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Which statement about the gyrocompass is FALSE（）.
When changing from a compass course to a true course you should apply（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
This induced magnetism（）the permanent magnetism already present in the ship.