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Tactical air navigation system

A tactical air navigation system, commonly referred to by the acronym TACAN, is a navigation system used by military aircraft. It provides the user with bearing and distance to a ground or ship-borne station. It is a more accurate version of the VOR/DME system that provides bearing and range information for civil aviation. The DME portion of the TACAN system is available for civil use; at VORTAC facilities where a VOR is combined with a TACAN, civil aircraft can receive VOR/DME readings. Aircraft equipped with TACAN avionics can use this system for en route navigation as well as non-precision approaches to landing fields. The space shuttle is one such vehicle that was designed to use TACAN navigation but later upgraded with GPS as a replacement. The typical TACAN onboard user panel has control switches for setting the channel, the operation mode for either Transmit/Receive or Receive Only. Capability was later upgraded to include an Air-to-Air mode where two airborne users can get relative slant-range information. Depending on the installation, Air-to-Air mode may provide range, closure, and bearing, though an air-to-air bearing is noticeably less precise than a ground-to-air bearing. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video