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Glossary

Sonar

Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater) to navigate, communicate with or detect other vessels.

There are two kinds of sonar: active and passive.

Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of 'targets' in the water.

For more information see echo sounding and ASDIC.

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