compass variation error 中文意思是什麼
compass variation error
解釋
羅經磁差-
Compass variation error
羅盤變動誤差 -
If this compass variation or error is not compensated for, a navigator could find himself far off course and in deep trouble
如果指南針偏差或錯誤沒有正確補償,一個航海家會發現他自己偏離航程太遠和麻煩太大。
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