Definition of dead reckoning in English:

dead reckoning

Syllabification: dead reck·on·ing

noun

The process of calculating one’s position, especially at sea, by estimating the direction and distance traveled rather than by using landmarks, astronomical observations, or electronic navigation methods.
More example sentences
  • In dead reckoning you estimate distance traveled along a given heading as a function of velocity and elapsed time.
  • It was the Greeks who pioneered modern methods of navigating by calculation rather than by dead reckoning.
  • At first, crews had to rely on dead reckoning - estimating position by speed, flying time and compass.

Definition of dead reckoning in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)