Dead-reckoning meaning

A method of estimating the position of an aircraft or a ship without astronomical observations, as by applying to a previously determined position the course and distance traveled since.
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Predictive calculation based on inference; guesswork.
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The finding of a ship's position by an estimate based on data recorded in the log, as speed and the time spent on a certain course, rather than by more precise means, as astronomical observations or Loran.
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A method of estimating the position of a ship or aircraft by applying estimates of the distance and direction travelled to a previously known position. In respect to ships/boats, it excludes the effect of wind and current on the vessel. Compare with estimated position. Abbreviation: DR.
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Origin of dead-reckoning

Possibly alteration of ded. abbr. of deduced from deduce to trace from the beginning deduce