Definition
An off-airway, area navigation route flown directly between waypoints chosen by the pilot or assigned by ATC, rather than along a published airway. It is available to aircraft equipped with approved RNAV (area navigation) systems and may be flown at any altitude where direct routing is approved.
Plain English
A direct route between points you pick (or ATC assigns) instead of following the established highways in the sky. Your navigation equipment lets you fly straight to those points without needing a ground-based station along the way.
Context Anchor
Seen in IFR flight planning and en route clearances when a flight is routed direct between points instead of along federal airways or published RNAV routes.
Derivation
‘Random’ here doesn’t mean haphazard — it means ‘not pre-published.’ ‘RNAV’ stands for area navigation, a system that lets an aircraft fly any desired path within the coverage of its navigation sensors, instead of being tied to overflying ground stations.
Why Pilots Care
These routes often shorten distance, reduce fuel use, and allow more flexible routing in radar environments.
Intuition Check
Do not read random as unsafe, casual, or made up in flight. Here it means not on a published airway or published RNAV route, but still cleared and controlled.
Example Sentence 1
After departure, the crew was cleared on a random RNAV route direct to a waypoint 300 miles ahead, bypassing the normal airway structure.
Example Sentence 2
Filing a random RNAV route instead of following airways shortened our flight by twenty minutes.