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sonar vs. radar

[ soh-nahr ]
  1. a method for detecting and locating objects submerged in water by echolocation.
  2. the apparatus used in sonar.
[ rey-dahr ]
  1. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns.
  2. a means or sense of awareness or perception: lobbyists working under the media's radar.

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