dead-reckoning

The Sailor's Word-Book

The estimation of the ship's place without any observation of the heavenly bodies; it is discovered from the distance she has run by the log, and the courses steered by the compass, then rectifying these data by the usual allowance for current, lee-way, &c., according to the ship's known trim. This reckoning, however, should be corrected by astronomical observations of the sun, moon, and stars, whenever available, proving the importance of practical astronomy.

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