I just installed a Garmin 545s on my

. I did get the run around on trying to find a "in-land lake" for my system. I did look at the Navimatics and others at Bass Pro, Boater's World, and West Marine, but they would not adapt to my system, not to say it won't work in yours, but make sure you get the right type of card. I finally had to order it directly from Garmin and love it! I do have mine backed up with sonar due to the low lake levels in Texas, but the Garmin card has worked great. Let us know if you did get it and how it works for you.
Gregg