Plain English Meaning

A fix is a named spot in the sky. Pilots use it to report their position, to mark where to turn, or to identify the start or end of a segment of a route or approach.

Full Definition

Geographically defined points used in navigation to identify a specific position along a route or procedure. A fix can be established by ground-based navigation aids (such as VOR radials or DME distances), by GPS coordinates, or by the intersection of two such references, and is typically named with a five-letter pronounceable identifier on en route and approach charts.