Definition
A ground-based radio facility that transmits a single, fixed test signal used by pilots to verify the accuracy of their aircraft's VOR receiver. The VOT broadcasts an omnidirectional signal that simulates a radial from magnetic north, so a correctly functioning VOR receiver tuned to the VOT frequency will display 0° FROM (or 180° TO) regardless of the aircraft's actual position. Allowable error during the check is ±4°.
Plain English
A small radio station on the ground that sends out one steady test signal so a pilot can check whether their VOR navigation equipment is reading correctly before flight.
Context Anchor
Seen during instrument training, preflight planning, and required VOR receiver accuracy checks listed in FAA procedures and airport information.
Derivation
VOR stands for VHF Omnidirectional Range. The added 'T' simply marks it as a test version of that signal — a stationary reference designed only for checking equipment, not for navigation.
Why Pilots Care
Confirms the VOR receiver meets accuracy tolerances required for safe instrument navigation.
Grounding Statement
Tune the VOT, set up the VOR receiver as required, and the display should show the known test reading if the receiver is working within limits.
Intuition Check
Do not think of a VOT as a normal navigation aid for flying a course. It is a known test signal used to check the airplane's VOR receiver.
Example Sentence 1
Before departing on the IFR flight, the pilot tuned the VOT frequency on the ground and confirmed the VOR needle centered within the allowable 4° tolerance.
Example Sentence 2
After maintenance the avionics shop used the VOT signal to confirm the instrument was within tolerance limits.