[Mee-n-Mac]

I believe Bizer tried to get Garmin to use their lake chart but Garmin declined. As UTS mentions Bizer started to look into a version for Garmins but so far nothing has come of it. Thus right now you're out of luck - kinda.

Garmin's maps are in some proprietary format but in the last year I found some websites that claimed a degree of success in making their own maps for Garmin's chart-plotting GPS receivers. I sure if you do a little Googling you can find them as well (I don't have the URLs on this PC). So if you care to try, you can find software that will take maps (like the digital version Bizer sells) in .bmp (and some other) format(s) and turn them into files downloadable and readable by some Garmin GPS's. A few years ago you'd have been stuck with Garmin's low fidelity version for the lake. If this route doesn't appeal to you then you're OoL with the Garmin. Search this forum for alternative units that do accept a C-MAP chip of Winni.