Magnetic variation （磁差）changes with a change in ___. A. the vessel‘s heading B. sea conditions C. seasons D. the vessel‘s position

单选题

Compass error is equal to the ____.A. deviation minus variationB. variation plus compass courseC. combined variation and deviationD. difference between true and magnetic heading

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单选题

magnetic

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单选题

The error in a magnetic compass caused by the vessel‘s magnetism is called _____ . A. variation B. deviation C. compass error D. bearing error

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问答题

个体差异(individual variation)

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单选题

The compass rose on a nautical chart indicates both variation and ____ .A. deviation B. annual rate of variation changeC. precession D. compass error

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