Editing Radio navigation (section)

===DME===
{{main|Distance measuring equipment}}
{{see also|Tactical air navigation system}}
In the post-war era, a general navigation system using transponder-based systems was deployed as the [[distance measuring equipment]] (DME) system.{{fact|date=July 2022}}

DME was identical to Gee-H in concept, but used new electronics to automatically measure the time delay and display it as a number, rather than having the operator time the signals manually on an oscilloscope. This led to the possibility that DME interrogation pulses from different aircraft might be confused, but this was solved by having each aircraft send out a different series of pulses which the ground-based transponder repeated back.

DME is almost always used in conjunction with VOR, and is normally co-located at a VOR station. This combination allows a single VOR/DME station to provide both angle and distance, and thereby provide a single-station fix. DME is also used as the distance-measuring basis for the military [[TACAN]] system, and their DME signals can be used by civilian receivers.{{fact|date=July 2022}}