Plain English Meaning

A navigation point that isn't printed on the charts. It's made up for a particular flight, usually by giving its position relative to something already known, like 'fifteen miles north of this VOR.'

Full Definition

A geographic point used for navigation or air traffic control that is not depicted on standard published charts or in official navigation databases. It is typically defined by a controller or pilot using coordinates, a radial and distance from a navaid, or a bearing and distance from a known fix, and exists only for the duration of a specific clearance or flight plan.