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Tactical air navigation system
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==Benefits== [[Image:USS Raleigh (LPD-1) TACAN.jpg|thumb|A shipboard TACAN antenna on [[USS Raleigh (LPD-1)|USS ''Raleigh'' (LPD-1)]] with a [[lightning rod]] extending above it]] Because the azimuth and range units are combined in one system it provides for simpler installation. Less space is required than a VOR because a VOR requires a large counterpoise and a fairly complex phased antenna system. A TACAN system theoretically might be placed on a building, a large truck, an airplane or a ship, and be operational in a short period of time. An airborne TACAN receiver can be used in air-to-air mode to provide the approximate distance between two coordinating aircraft by selecting channels with 63 channels of separation (e.g., aircraft #1 sets channel 29 into its TACAN and aircraft #2 sets channel 92 into its TACAN.). It does not provide relative bearing.
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