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
- 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.
- Predictive calculation based on inference; guesswork.
Origin of dead reckoningPossibly alteration of ded., abbr. of deduced, from deduce, to trace from the beginning; see deduce.