The VOR system (VHF omni range) is less prone to interference from thunderstorms, and provides improved accuracy. It is still the backbone of the air navigational system today. VOR receivers allow the pilot to specify a radial, that is, a line extending outward from the VOR transmitter at a particular angle from magnetic north. Then, a course deviation indicator (CDI) shows the amount by which the aircraft is off the chosen course. Distance measuring equipment (DME) was added to many VOR transmitters and receivers, allowing the distance between the station and the aircraft to be shown
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