单项选择题

If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE? （）

A.Compass error and variation are equal
B.Compass north will be true north
C.Variation will equal deviation
D.There will be no compass error

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热门试题

单项选择题

The Flinders bar on a magnetic compass compensates for the（）.

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

单项选择题

If the compass heading and the magnetic heading are the same then（）.

A.the deviation has been offset by the variation
B.there is something wrong with the compass
C.the compass is being influenced by nearby metals
D.there is no deviation on that heading