Ground-Based Navigation - Very High Frequency Omni
the very high frequency omni-directional range (vor) is a ground-based electronic system that provides azimuth information for high and low altitude routes and airport approaches. to maintain a highly reliable, safe, and efficient ground-based navigation system through relocation or conversion to
a vortac is a radio-based navigational aid for aircraft pilots consisting of a co-located vhf omnidirectional range beacon and a tactical air navigation system (tacan) beacon. both types of beacons provide pilots azimuth information, but the vor system is generally used by civil aircraft and the tacan system by military aircraft.
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navigation - How does TACAN work? - Aviation Stack Exchange
a vor/dme station actually uses the dme portion of a tacan, that's why it is common to see vortac which are complete dual vor+tacan stations rather than simple vor+dme. a tacan is small and can be installed on ships or mobile stations (a vor is large); a tacan is usually more powerful than a vor and has a larger range of use.
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very high frequency (vhf) omni-directional range (vor) is a type of short-range radio navigation system for aircraft, enabling aircraft with a receiving unit to determine its position and stay on course by receiving radio signals transmitted by a network of fixed ground radio beacons.it uses frequencies in the very high frequency (vhf) band from 108.00 to 117.95 mhz.