Plain English Meaning
A way of pinpointing where the aircraft is by measuring how far it is from two different ground stations at the same time. Where those two distances cross is your location.
Full Definition
A position fix determined by measuring the slant-range distance from two separate DME (Distance Measuring Equipment) ground stations simultaneously. The aircraft's position is established at the point where the two distance arcs intersect, providing a reliable fix without needing a VOR bearing.
Context Anchor
Seen in instrument navigation, especially when discussing DME errors, area navigation systems, and how an aircraft position is calculated without using only one .