推すい測そく航こう法ほう

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が使つかえない海かい域いきでは、推すい測そく航こう法ほうが重じゅう要ような航こう法ほう手しゅ段だんとなる。

  In sea areas where GPS is unavailable, dead reckoning becomes an important navigation method.

• パイロットは推すい測そく航こう法ほうを用もちいて現げん在ざい位い置ちを推すい定ていした。

  The pilot estimated the current position using dead reckoning.