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I would like to make a bathymetric map (depths) of a lake. So i'm thinking of using a Raspberry Pi connected to a GPS and sonar. Is there a echosounder/sonar device that can be connected to a Raspberry Pi?

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Search for NMEA depth sounder, there are plenty of them. You should then be able to plot it out using OpenCPN, or convert and overlay on Google Earth or similar.

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