单项选择题

A.The Flinders barB.The heeling magnetC.Quadrantal soft……

The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）

A.The Flinders bar
B.The heeling magnet
C.Quadrantal soft iron spheres
D.Bar magnets in the binnacle

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单项选择题The vertical angle between the horizontal and the magnetic line of force is the（）.

A.elevation
B.magnetic angle
C.vertical angle
D.dip

单项选择题The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.

A.divisional parts
B.coefficients
C.fractional parts
D.equations

单项选择题The standard magnetic compass heading differs from the true heading by（）.

A.compass error
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D.deviation

单项选择题The reaction of a gyrocompass to an applied force is known as（）.

A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect

单项选择题The quadrantal spheres are used to（）.

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