Many species of sharks do not use sonar, as they have very effective senses, but some species are thought to. The hammerhead shark, in particular, is thought to use sonar waves detection.
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Scuba Divers use a Sonar to find treasure or a hidden ship.
SONAR is an acronym created by the navy that is the name of what they use to locate items under water. But if you wanted to, you could say the bats using echolocation on land is a type on SONAR. They basically both use sound to locate objects so they are really not very different at all.
Botos use sonar to navigate and hunt. They resemble dolphins.
Sonars were used to detect any objects that got into the detection field of the sonar. By this, the military could detect enemy submarines etc., which they couldn't see normally because of the opacity and/or darkness of the water.
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