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      Flight 370 search using state-of-the-art sonar and radar tech

      |With the search for Malaysia Airlines Flight 370 going nowhere for weeks, the massive, multi-national effort is now entering a new stage - with cutting-edge radar, sonar and state-of-the-art satellite imagery. Greg Charvat, radar expert and author of "Small and Short-Range Radar Systems," talks about the technology's hope and limitations.