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com'pass devia'tion card"

a card, sheet, or the like, with two compass roses printed on it concentrically, for recording, on a given voyage, the amount of deviation for which the navigator must compensate in using the ship's compass to steer a magnetic course.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

compass deviationcompassion


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