Underwater ground mapping

Hi!
I would like to build a boat using Navio2 coupled with a sonar to record water deepness as well as potential presence of fishes.

Has anybody already experienced such project? I would particularly like to know what kind of sonar to use (Ardupilot recommends a model but after contacting the supplier it costs no less than 1000usd per sonar…). So the idea would rather be to interface a 100usd fish finder and make the infos available through a mavros node, and re interpret the GPS and sonar data in correlation to build an underwater 3D mapping

Thanks for any advice on hardware, contacts, etc…

Guillaume

Yes, and becoming increasingly popular…

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