Definition
The cockpit display used with a VOR (Very High Frequency Omnidirectional Range) receiver that shows the aircraft's position relative to a selected course to or from a VOR ground station. It typically consists of an Omni Bearing Selector (OBS) to choose a course, a Course Deviation Indicator (CDI) needle showing left/right displacement from that course, and a TO/FROM indicator showing whether flying the selected course will take the aircraft toward or away from the station.
Plain English
The instrument in the cockpit that works with a VOR radio to show the pilot which way to fly to track a chosen path to or from a ground station. The pilot picks a course, and the instrument shows whether the aircraft is on it, left of it, or right of it.
Context Anchor
Seen when learning to use VOR navigation, especially when setting a course and reading the left-right needle indication in the cockpit.
Derivation
Omni comes from the Latin omnis, meaning all or every. The VOR ground station broadcasts navigation signals in every direction (360 radials), so the cockpit instrument that interprets those signals is called an omninavigation instrument — one that can navigate using signals from any direction around the station.
Why Pilots Care
Allows flexible course selection and accurate tracking without being limited to specific compass directions or published airways.
Intuition Check
“Omninavigation instrument” does not mean an all-purpose navigation system. Here it means the cockpit indicator used to display selected VOR course guidance.
Example Sentence 1
After tuning and identifying the VOR, the pilot turned the OBS on the omninavigation instrument to 030 to track inbound on the selected radial.
Example Sentence 2
By adjusting the selector on the omninavigation instrument, the pilot could intercept a new path to the station from any angle.