A.before correcting for any deviation
B.after correcting for variation
C.after adjusting the fore-and-aft and athwartships permanent magnets
D.before the quadrantal correctors are placed on the compass
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A.The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings
B.After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustment
C.During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearing
D.After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error
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
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
最新試題
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
The quadrantal spheres are used to（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
The line which connects the points of zero magnetic dip is（）.
Variation is a compass error that you（）.
When relieving the helm，the new helmsman should know the（）.
Which compensates for errors introduced when the vessel heels over（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
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.