Dead ReckoningA calculation of the ship's place without any observation of the heavenly bodies. A guess made by consulting the log, the time, the direction, the wind, and so on. Such a calculation may suffice for many practical purposes, but must not be fully relied on. Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Dead Reckoning from Infoplease:
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