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
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
When changing from a compass course to a true course you should apply（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
Which compensates for errors introduced when the vessel heels over（）.
This induced magnetism（）the permanent magnetism already present in the ship.
When relieving the helm，the new helmsman should know the（）.
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.