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High-frequency waves are used in a sound navigation and ranging
system called _____.

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High-frequency waves are used in a sound navigation and ranging
system called SONAR WAVES.

Sonar (originally an acronym for SOund Navigation And Ranging) is 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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