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dead-reckon

[ded-rek-uh n]
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verb (used with object) Navigation.
  1. to calculate (one's position) by means of dead reckoning.

Origin of dead-reckon

by back formation
Related formsdead-reck·on·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018