Operating Principle: the measurement of the time between the transmission of an aircraft interrogating signal and the receipt of a matched pulse reply signal from a ground station (the 2 signals having different frequencies).
DME operates in the UHF range, but can be collocated with a VOR or ILS, or occasionally NDB. Distance information can also be obtained from TACAN stations by selecting the paired VOR frequency.
DME measures slant range, not distance along the ground. Therefore, the greatest error occurs when flying high and close to the station.
Tolerance at a VOR checkpoint: +/- 0.5 NM
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