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Noun: distance measuring equipment
  1. (aviation) a transponder-based radio navigation technology that measures line-of-sight (slant range) distance to a ground station
    "At 5000 feet over flat terrain, you might expect to get about 60 miles of distance measuring equipment range. Over rough terrain, the range can be much shorter: 30 or 40 miles.";
    - DME

Encyclopedia: Distance measuring equipment