單項選擇題When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）

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


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1.單項選擇題When a magnetic compass is not in use for a prolonged period of time it should（）.

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

2.單項選擇題What is the name of the movable，radial guide line used to measure direction on a radar?（）

A.Compass rose
B.Cursor
C.Plan position indicator
D.Variable range marker

3.單項選擇題What is the basic principle of the magnetic compass?（）

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

4.單項選擇題What is an advantage of the magnetic compass aboard vessels?（）

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

5.單項選擇題What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）

A.Quadrantal spheres
B.Heeling magnets
C.Athwartships magnets
D.Fore-and-aft magnets