Plain English Meaning

A VOR ground station that sits somewhere away from the airport but is still used to fly the approach into that airport. The pilot tracks a course from the off-field station toward the runway instead of flying directly over the station to land.

Full Definition

A VOR (VHF Omnidirectional Range) navigation station whose antenna is located somewhere other than on the airport itself, used as the primary navigation aid for an instrument approach to that airport. Because the station is not on the field, the final approach course is typically a radial from the VOR that is aligned to the toward the runway, and the is determined by time or distance from the station rather than by over the airport.