A.compass north
B.the direction of the vessel's head
C.magnetic north
D.a relative bearing taken with an azimuth circle
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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
A.needles are nearly in line with the meridian
B.vessel is near the magnetic poles
C.variation is near zero
D.vessel is near the magnetic equator
A.induced magnetism in vertical soft iron
B.induced magnetism in horizontal soft iron
C.permanent magnetism in ship's steel
D.vessel's inclination from the vertical
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This induced magnetism（）the permanent magnetism already present in the ship.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Which compensates for errors introduced when the vessel heels over（）.
Variation in a compass is caused by（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The line which connects the points of zero magnetic dip is（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The Flinders bar on a magnetic compass compensates for the（）.