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Sonar system is a technique that uses sound propagation for underwater activities.Sonar is simply making use of an echo. When an animal or machine makes a noise, it sends sound waves into the environment around it. Those waves bounce off nearby objects, and some of them reflect back to the object that made the noise.
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Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation usually underwater, as in submarine navigation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.

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