dead reckoning

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dead reckoning

The navigator plots the ship's course using dead reckoning.

Definition
  1. Noun:
    • Navigation without the aid of celestial observations: A method of calculating one's current position in navigation by using a previously determined position, and advancing that position based upon known or estimated speeds over elapsed time and course.
    • An estimate based on little or no information: A guess or calculation made without having all the necessary facts or data.
Usage Examples
  • Noun (Navigation):
    • The sailors used dead reckoning to navigate through the fog when the stars were not visible.
    • Before modern GPS, pilots often relied on dead reckoning for long flights over featureless terrain.
  • Noun (Estimate):
    • Without the sales report, my budget forecast is just dead reckoning.
    • He gave a dead reckoning of the project's cost, admitting it was a rough guess.
Advanced Usage
  • "by dead reckoning": Using the method of dead reckoning.
    • The ship sailed by dead reckoning for three days after the storm damaged its instruments.
  • Used to emphasize the speculative or non-scientific nature of an estimate.
    • The politician's promise was based more on dead reckoning than on economic data.
Variants and Related Words
  • Deduced Reckoning (DR): A formal synonym for the navigational meaning of dead reckoning.
  • Guesstimate (n): An informal estimate based on a mixture of guesswork and calculation, similar to the second meaning.
  • Pilotage (n): Navigation by visual reference to landmarks, often contrasted with dead reckoning.
Synonyms
  • Navigation meaning: Deduced reckoning, DR, estimated position.
  • Estimate meaning: Guess, conjecture, rough estimate, speculation, ballpark figure.
Related Phrases
  • To reckon without: To fail to consider a factor (idiomatically related through the verb "to reckon").
    • They had reckoned without the possibility of bad weather.
  • Dead in the water: An idiom meaning completely stalled or unable to proceed (not directly related but shares the word "dead").
    • Without the new data, the research project is dead in the water.
Related Idioms
  • A shot in the dark: A wild guess, very similar to the "estimate" meaning of dead reckoning.
    • His answer was a complete shot in the dark, pure dead reckoning.
dead reckoning

The navigator plots the ship's course using dead reckoning.

Noun
  1. navigation without the aid of celestial observations
  2. an estimate based on little or no information

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