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  1. Sonar - Wikipedia

  2. Sonar: Seeing with Sound - Deep Ocean Education Project

  3. What is sonar? - NOAA's National Ocean Service

  4. Basic Sonar System (Active) - Federation of American Scientists

  5. Exploration Tools: Sonar: NOAA Office of Ocean Exploration ...

  6. Explain the Working and Application of SONAR - GeeksforGeeks