sounder fishfinder for use with openCPN

[captainjim47]

I am trying to identify sounders and/or fishfinders that will I/F to openCPN via USB(usb to nmea183 or 2000) or LAN(RJ-45) or even audio in for analog.

I have found transducers with data outputs that could be used but this is a 100+ ton wood yacht with a number of existing transducers in hull. I have experience working with AIRMAR FAE's to use installed transducers with new equip until the next haul out... they work well enough for nav.

Any suggestions? Thanks.