Sonar

**__SONAR__** SONAR is an acronym for SOund Navigation And Ranging. SONAR uses acoustic signals and echoes to communicate or detect objects. SONAR is also used to create maps of the ocean floors. There are two different types of SONAR, passive which is used to listen to vessels, and active which uses the echoes and acoustic signals. Animals such as dolphins use SONAR to communicate and to find prey! In 1490 the idea of SONAR first came up in the world when artist/scientist Leonardo De Vinci first used a tube stuck in the water and used it to listen to the vessels. During WWI the need for SONAR increased to detect submarines so more research went into SONAR. SONAR is sometimes interfered with small objects. These objects cause scattering

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