electronic distance-measuring equipment

electronic distance-measuring equipment

[i‚lek′trän·ik ′dis·təns ‚mezh·ə·riŋ i‚kwip·mənt]
(navigation)
A navigation system consisting of airborne devices that transmit microsecond pulses to special ground beacons, which retransmit the signals to the aircraft; the length of expired time between transmission and reception is measured, converted to kilometers or miles, and presented to the pilot.
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