distance-measuring equipment

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distance-measuring equipment

in aerial navigation, equipment for measuring distance by converting the time a special electronic pulse takes to travel from an aircraft to a ground station and for an answering pulse to return. The airborne equipment displays the information to the pilot. When used in connection with a radio-range bearing, which indicates direction, a DME reading shows the pilot the exact position of his aircraft.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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