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What do you mean by the term SONAR?

Sound Navigation and ranging. 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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a system for the detection of objects under water by emitting sound pulses and detecting or measuring their return after being reflected.
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Definition of sonar. : a method or device for detecting and locating objects especially underwater by means of sound waves sent out to be reflected by the objects also : a device for detecting the presence of a vessel (such as a submarine) by the sound it emits in water.
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The full form of SONAR is Sound Navigation and Ranging. It is a technique used for sound propagation usually in ships and submarines to detect objects on the sea or ocean floor by sending ultrasonic sound waves down to identify objects such as rocks or other vessels.
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