How to find a submarine (no, it's not just a case of flicking the sonar on)
Telecommunication Engineering - SONAR (SOund Navigation And Ranging). Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate,
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Sonar Sound Navigation And Ranging Stock Illustration - Download Image Now - Sonar, Submarine, Sea - iStock