VHF Omnirange (VOR).

Equipment that determines bearing to a radio station with a VOR transmitter; VOR transmitters usually contain ILS transmitters in addition to VOR; A basic guidance mode, providing lateral guidance to a VOR station. A VOR/ILS/MB. radio receiver provides a VHF Omni-Direction Range (VOR) function and Instrument Landing System with Marker Beacon (MB) function. VOR provides bearings to a fixed point (Localizer function); ILS/MB provides course (localizer function) and glideslope deviations (Glide Slope (G/S) function) during approach to a runway, along with marker beacon indications. If VOR is collocated with a TACAN (VOR-TAC, or VORTAC), bearing and range information is provided.