Plain English Meaning

A named point on a chart that exists to mark where airspace begins, ends, or changes — not to guide an aircraft along a route.

Full Definition

A named geographic point used to define airspace boundaries or to support air traffic control functions, rather than to mark a position on a published flight route. Airspace fixes are used for purposes such as defining the edges of special use airspace, oceanic transition points, holding patterns associated with airspace boundaries, or coordination points between ATC facilities.

Context Anchor

Seen in instrument procedure discussions, RNAV/ , route design, and charted fixes that do not correspond to a visible object.