| 1. | calculation of one's position on the basis of distance run on various headings since the last precisely observed position, with as accurate allowance as possible being made for wind, currents, compass errors, etc. |
| 2. | one's position as so calculated. |

| dead reckoning n.
[Possibly alteration of ded., abbr. of deduced, from deduce, to trace from the beginning; see deduce.] |
dead reckoning
determination without the aid of celestial navigation of the position of a ship or aircraft from the record of the courses sailed or flown, the distance made (which can be estimated from velocity), the known starting point, and the known or estimated drift
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