Definition
A method of navigation that allows an aircraft to fly any desired flight path within the coverage of position-referenced navigation aids, or within the limits of the capability of self-contained navigation systems, rather than being restricted to flying directly to or from ground-based navigation stations.
Plain English
RNAV lets a pilot fly along any chosen route by following a series of waypoints stored in the navigation system, instead of being forced to fly straight lines between ground radio stations.
Context Anchor
Seen in flight planning, avionics setup, instrument procedures, and ground training discussions about modern navigation equipment.
Derivation
Short for 'Area Navigation.' The 'area' part is the key: older navigation tied the aircraft to a line drawn from a specific ground station. RNAV freed flight paths to go anywhere within an 'area' of signal coverage or system capability — hence the name.
Why Pilots Care
It supports direct routing, lower fuel use, and access to more flexible approaches and waypoints.
Analogy
RNAV is like using a car navigation app that can guide you along a chosen route between map points, instead of only letting you drive from one landmark to the next.
Intuition Check
RNAV is not one specific instrument or one specific satellite system. It is a method of navigation that can use different approved equipment to guide the aircraft along a chosen path.
Example Sentence 1
The pilot loaded the RNAV departure procedure into the flight management system before taxi.
Example Sentence 2
During the RNAV approach the aircraft followed a series of waypoints that did not align with any ground-based radio aid.