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單項選擇題

The vertical angle between the horizontal and the magnetic line of force is the（）.

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

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單項選擇題

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

單項選擇題

The standard magnetic compass heading differs from the true heading by（）.

A.compass error
B.latitude
C.variation
D.deviation

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