A.like magnetic poles attract
B.unlike magnetic poles repel
C.unlike poles attract
D.the poles of the compass line up with the geographic poles of the earth
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A.north magnetic pole
B.south magnetic pole
C.magnetic prime vertical meridian
D.magnetic equator
A.compass north
B.the direction of the vessel's head
C.magnetic north
D.a relative bearing taken with an azimuth circle
A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card
A.deviation
B.variation
C.compass error
D.dip
A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error
最新試題
A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°.Which action should be taken to remove this error during compass adjustment（）.
The most accurate method of determining gyrocompass error while underway is by（）.
The quadrantal spheres are used to（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
What is the basic principle of the magnetic compass（）.
Variation in a compass is caused by（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.