Looks like you never got an answer to your question. I just ditched my jet ski and want ot move my echomap to my atv and run Bob-T maps for Hatfield McCoy. I already have a Garmin topo map which runs beautifully. But when I download Bob's map (disc image file specifically for Garmin) it says not supported. Kinda sucks. Guess I'll buy a used Nuvi or Drive.