VOR DOC RNAV

Designated Operational Coverage is the area within which the VORVOR —VHF Omnidirectional Range signal is guaranteed to be accurate. As the VORVOR —VHF Omnidirectional Range does not suffer from night effect (as it is in the VHFVHF —Very High Frequency band, and so a space wave) there are no time limitations on when it may be used — unlike the NDBNDB —Non-Directional Beacon, and its equivalent of DOCDOC —Designated Operational Coverage, called Promulgated Range, which cannot be used at night. If you fly outside of this area, other VORVOR —VHF Omnidirectional Ranges may interfere with your signal, causing errant bearing indications.