By use of a loop antenna, the device senses the direction to the transmitting station. Often used by aircraft to locate airports and towns not served by other navigation systems. Widely used by aircraft. VOR stations are scattered throughout the US, North America, and world. Provides both azimuth and distance to the station.
Signal is broadcast in one degree increments.
You can fly to or from the signal. Each station has its own frequency and transmits a verification that one is tuned to the correct station. Primarily a marine navigation device. The system is being phased out and replaced with GPS systems. By using time difference between stations, one can determine their position .