It's one of the most controversial new pieces of electronics: omnidirectional sonar.
Advances made by China in the Field of ASW Sonar Systems - Indian Defence Review
Titan families told of potential 'implosion' sound Navy detected before news reports - ABC News
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All You Wanted to Know about CHIRP Sonar - Wired2Fish
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Sonar wars flare: Humminbird Mega, Garmin UHD, Lowrance FishReveal & more - Panbo
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Marine Electronics for Offshore Sport-Fishing Boats
Warship sonar could be causing mass dolphin deaths in the Black Sea
Report on sonar
Sonar in the Sea Services Naval History Magazine - April 2020, Volume 34, Number 2
Sonar Man - a poem by GeorgeP - All Poetry
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Marine Electronics for Offshore Sport-Fishing Boats