Definition
A ground-based radio navigation aid operating in the 108.0 to 117.95 MHz VHF band that transmits signals in every direction from the station, allowing a properly equipped aircraft to determine its bearing to or from that station along any of 360 selectable courses called radials.
Plain English
A radio beacon on the ground that broadcasts signals out in all directions. An instrument in the cockpit reads those signals and tells the pilot which direction the station lies from the aircraft, so the pilot can fly toward it, away from it, or along a chosen line through it.
Context Anchor
Seen on navigation displays, course indicators, and instrument procedures when using radio navigation instead of, or along with, GPS.
Derivation
"Very high frequency" refers to the radio band used (30 to 300 MHz). "Omnidirectional" comes from Latin omnis (all) and "directional," meaning the station radiates usable signals in every direction rather than along a single beam. "Range" here means a navigation aid that provides bearing information, not a measurement of distance.
Why Pilots Care
Supplies accurate, reliable directional guidance independent of visual references, supporting enroute navigation and instrument approaches.
Grounding Statement
Picture a ground station sending out direction lines in every direction, and the airplane’s receiver showing which line you are on or trying to follow.
Intuition Check
Range does not mean the airplane’s fuel range or maximum distance here. In this term, range means a radio navigation aid that provides course guidance.
Example Sentence 1
After departure, the pilot tuned the VOR frequency, identified the station by its Morse code, and tracked outbound on the 270 radial.
Example Sentence 2
During the instrument approach briefing, the crew confirmed the very high frequency omnidirectional range identifier before crossing the initial approach fix.