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Sonar is the technique of listening to sounds underwater to detrmine what is there.

In passive sonar, objects not generating any sound will not be detected.

Active sonar means that sound waves are generated and emitted. The device then listens for the sound being reflected back. That detects objects such as obstructions/rocks as well as other boats or underwater objects.

The reflected wave is measured and the time delay noted as well as the direction of the reflected sound wave. These give the user a very good idea of the type, size as well as speed of the object.

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Q: How does a sonar works in a boat or a ship?
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