Definition
A ground-based radio transmitter operated by the FAA that broadcasts a single, fixed test signal on a published VHF frequency, allowing pilots to verify the accuracy of their aircraft's VOR receiver before flight. A correctly functioning VOR receiver tuned to a VOT will indicate 0° FROM (or 180° TO) the station, with the course deviation indicator centered, regardless of the aircraft's position on the airport.
Plain English
A special radio signal at certain airports that pilots use to check whether their VOR navigation equipment is reading correctly. If the instrument shows the expected reading when tuned to it, the equipment is working accurately enough to use for navigation.
Context Anchor
Seen in VOR receiver accuracy checks and in airport information sources that list VOT locations and frequencies.
Derivation
VOT stands for VOR Test. The 'T' simply marks it as a test transmitter — its only job is to provide a known, fixed signal so pilots can confirm their receiver is reading that signal correctly.
Why Pilots Care
Confirms VOR accuracy before relying on it for navigation or instrument approaches.
Intuition Check
Do not treat a VOT like a normal VOR station to navigate from. A VOT provides a known test signal so you can verify the receiver’s accuracy.
Example Sentence 1
Before departing on the IFR flight, the pilot taxied to the run-up area, tuned the VOT frequency listed in the Chart Supplement, and confirmed the VOR needle centered on 0° FROM.
Example Sentence 2
During the annual inspection the mechanic used the local VOT signal to confirm the VOR receiver met required tolerances.