VOR

A VOR is a ground-based transmitter on the VHF band that broadcasts bearing information in every direction. Your aircraft receiver identifies which radial you are on, giving you a course to fly toward or away from the station. There are hundreds of VORs across the US and they have been the backbone of IFR navigation since the 1950s.

GPS has taken over most of the day-to-day VOR workload, but you still need a VOR receiver for many IFR operations and to fly published VOR approaches. The same receiver handles the ILS localizer, which is why you will see "VOR/ILS receiver" listed in aircraft equipment. Most VOR approach minimums are in the 400-800 ft range, higher than LPV or ILS.