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Dead Reckoning

   Also found in: Dictionary/thesaurus, Legal, Acronyms, Wikipedia, Hutchinson 0.01 sec.
dead reckoning: see navigation navigation, science and technology of finding the position and directing the course of vessels and aircraft. Early Navigational Techniques


In ancient times, mariners navigated by the guidance of the sun and stars and landmarks along the coast.
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dead reckoning
a method of establishing one's position using the distance and direction travelled rather than astronomical observations

dead reckoning [¦ded ′rek·ən·iŋ]
(navigation)
Determination of position of a craft by advancing a previous position to a new one on the basis of assumed distance and direction traveled.

Dead Reckoning 

the continuous calculation of the elements of a vessel’s course, such as speed and direction, and the effects of external forces in order to determine the vessel’s coordinates without observation of orientation points on shore or of heavenly bodies. The accuracy of dead reckoning is sufficient for keeping a vessel on the course set and for ensuring navigational safety. The quantities used are the ship’s heading and speed and the drift vector. When dead reckoning is performed on a map, the true course, distances traveled, and the ship’s turning trajectory and drift are calculated and plotted. The use of automatic position plotters in such dead reckoning permits continuous calculation of the vessel’s position; when dead reckoning is done by hand, positions are calculated sequentially at discrete time intervals. Analytic techniques for dead reckoning require the use of calculators.



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Sailing one direction, drifting another direction, to say nothing of the set of the current in some third direction, makes a resultant which dead reckoning can never calculate.
In the midst of this chopping sea of civilized life, such are the clouds and storms and quicksands and thousand-and-one items to be allowed for, that a man has to live, if he would not founder and go to the bottom and not make his port at all, by dead reckoning, and he must be a great calculator indeed who succeeds.
Captain Davenport worked up his dead reckoning, allowing generously for drift, and announced Moerenhout Island to be not more than ten miles off.
 
 
 
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