I run a pair of HDS Carbon 9's and have them connected together by the ethernet port as well as NMEA 2000 to the trolling motor. I use Genesis C-MAPS to upload and process my own mapping. There are lakes on the site you can upload free and I will do that then turn on my mapping while on the water and remap and update if depths do not appear accurate on the pre-loaded map compared to my graph.
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