如果指南针偏差或错误没有正确补偿，一个航海家会发现他自己偏离航程太远和麻烦太大。
If this compass variation or error is not compensated for, a navigator could find himself far off course and in deep trouble.
如果指南针偏差或错误没有正确补偿，一个航海家会发现他自己偏离航程太远和麻烦太大。
If this compass variation or error is not compensated for, a navigator could find himself far off course and in deep trouble.
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