dead reckoning

Noun
  1. An estimate based on little or no information (synset 105811946)
    is a type of: approximation, estimate, estimation, idea - an approximate calculation of quantity or degree or worth
    same as: guess, guessing, guesswork, shot
  2. Navigation without the aid of celestial observations (synset 100819055)
    is a type of: navigation, pilotage, piloting - the guidance of ships or airplanes from place to place

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