Etymology
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dead reckoning (n.)

"ascertaining of the position of a ship by measurement of the distance run" (without observation of heavenly bodies), 1610s, perhaps from nautical abbreviation ded. ("deduced") in log books, but it also fits dead (adj.) in the sense of "unrelieved, absolute."

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Definitions of dead reckoning

dead reckoning (n.)
an estimate based on little or no information;
Synonyms: guess / guesswork / guessing / shot
dead reckoning (n.)
navigation without the aid of celestial observations;
From wordnet.princeton.edu