seven-tenths rule

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seven-tenths rule [¦sev·ən ′tenths ‚rül]

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A thumb rule which states that the approximate distance to an object broad on the beam equals seven-tenths of the distance traveled by a craft while the relative bearing (right or left) changes from 22.5° to 45° or from 135° to 157.5°, neglecting current and wind.

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