noun
dead reckoning
Navigation technique that estimates current position based on a previously known position, using speed, heading, and elapsed time. Used in aviation, marine, and other navigation contexts.
GPSが使えない海域では、推測航法が重要な航法手段となる。
In sea areas where GPS is unavailable, dead reckoning becomes an important navigation method.
パイロットは推測航法を用いて現在位置を推定した。
The pilot estimated the current position using dead reckoning.