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Definitions:
Noun
guess
guesswork
guessing
shot
dead reckoning
Definition: an estimate based on little or no information
dead reckoning
Definition: navigation without the aid of celestial observations
Definition: 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