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In simple this device is use to determine the depth of the sea by sending sonar waves into it and checking the time and speed and by this calculating distance

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The fuction of SONAR is to find the depth of the sea . The SONAR transmitts ultrasonic waves into the sea . When these waves hit the ground and is  detacted by the detector . SONAR calculates the time taken ans the speed of these waves and tells us the depth of the sea
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