running fix

American  

noun

Navigation.

1. a fix made from a moving vessel or aircraft from observations made at different times, the course and distance run between the observations being considered.

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Etymology

Origin of running fix

First recorded in 1915–20

Example Sentences

As the sun moves across the sky, you can obtain successive LOPs, which can be advanced to plot a running fix, like taking bearings on the same lighthouse at intervals as you pass along a coast.

From Time Magazine Archive