A.divisional parts
B.coefficients
C.fractional parts
D.equations
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A.compass error
B.latitude
C.variation
D.deviation
A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect
A.remove deviation on the intercardinal headings
B.remove deviation on the cardinal compass headings
C.remove heeling error
D.compensate for induced magnetism in vertical soft iron
A.reduce the variation as much as possible
B.reduce the deviation as much as possible
C.reduce the magnetic dip as much as possible
D.allow the compass bowl to swing freely on its gimbals
A.a collision with another vessel
B.being moored on a constant heading for a long period of time
C.being struck by lightning
D.All of the above
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Which compensates for errors introduced when the vessel heels over（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
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（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The quadrantal spheres are used to（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.