A.Compass rose
B.Cursor
C.Plan position indicator
D.Variable range marker
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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
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
最新試題
Which statement about the gyrocompass is FALSE（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The most accurate method of determining gyrocompass error while underway is by（）.
Variation is a compass error that you（）.
When relieving the helm，the new helmsman should know the（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
What is an advantage of the magnetic compass aboard vessels?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
When changing from a compass course to a true course you should apply（）.