Plain English Meaning

A quick test the pilot does to make sure the aircraft's navigation computer is showing the right position before using it to fly the route.

Full Definition

A procedure in which the pilot verifies that an RNAV (Area Navigation) system is providing position information within acceptable tolerances before relying on it for navigation. This is typically done by comparing the RNAV-indicated position to a known reference point, such as an airport surveyed location or a designated checkpoint, and confirming the displayed distance and bearing fall within the limits published for that aircraft and equipment.

Context Anchor

Seen in before using for a or procedure, especially before an .