Plain English Meaning

Marked spots on the ground or in the air where you can check that your VOR navigation equipment is showing the correct direction. The book tells you where to park, what station to tune, and what reading you should see. If your indicator matches, your VOR is working accurately.

Full Definition

Designated locations on an airport surface or at specific airborne points where a pilot can verify the accuracy of the aircraft's VOR navigation receiver against a published bearing and frequency. The Chart Supplement U.S. lists these checkpoints, including the to use, the that should be indicated, the location on the airport (or in the air), and the distance from the station.