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[ded-rek-uh n] /ˈdɛdˈrɛk ən/
verb (used with object), Navigation.
to calculate (one's position) by means of dead reckoning.
Origin of dead-reckon
by back formation
Related forms
dead-reckoner, noun

dead reckoning

noun, Navigation.
calculation of one's position on the basis of distance run on various headings since the last precisely observed position, with as accurate allowance as possible being made for wind, currents, compass errors, etc.
one's position as so calculated.
1605-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for dead-reckoning
Historical Examples
  • We had also figured up the dead-reckoning separately, as much for practice as to avoid mistakes.

    Down South Oliver Optic
  • Reducing the dead-reckoning and meridian altitudes to noon of each day.

    The Sailor's Word-Book William Henry Smyth
  • According to the dead-reckoning we ought to be a little to the southward of French Shoal.

    Up the River Oliver Optic
  • He was not sure of his course and was sailing by dead-reckoning.

  • Oh, yes; that's quite easily calculated by 'dead-reckoning,' as sailors say.

    The Ice Queen Ernest Ingersoll
  • Why, a book-muster is something like dead-reckoning on a ship.

    An Outback Marriage Andrew Barton Paterson
  • I travelled with a captain once, and so long as he stuck to dead-reckoning he was all right.

    An Outback Marriage Andrew Barton Paterson
  • Of course, there is our dead-reckoning, but—but—wonder where the commodore got his position from?

    Merchantmen-at-Arms David W. Bone
  • They were off the road now, and D'Arragon was steering by dead-reckoning.

    Barlasch of the Guard H. S. Merriman
  • The bearing of an object on the coast from which a vessel commences her dead-reckoning and takes her departure.

    The Sailor's Word-Book William Henry Smyth
British Dictionary definitions for dead-reckoning

dead reckoning

a method of establishing one's position using the distance and direction travelled rather than astronomical observations
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for dead-reckoning

dead reckoning

might be from nautical abbreviation ded. ("deduced") in log books, but it also fits dead (adj.) in the sense of "unrelieved, absolute."

Online Etymology Dictionary, © 2010 Douglas Harper
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