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单词 seven-eighths rule
释义 seven-eighths rule
[¦sev·ǝn `āths ´rül]
NAVIGATION
A thumb rule which states that the approximate distance to an object broad on the beam equals seven-eighths of the distance traveled by a craft while the relative bearing (right or left) changes from 30 to 60° or from 120 to 150°, neglecting current and wind.
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