MyFishFinder.com Just like iceshanty but warmer
I have the same chip in my Garmin 78 and It's a great chip with a lot of detail. I fish Big Pine, Little Pine, Rush and Ottertail in your neck of the woods. My Dad Has the Lakemaster Chip and We have the same detail. I use it on Mille Lacs as well.
I use the Upper Midwest Fishing Guide in my handheld Garmin GSPMap 62st, it shows good lake topo detail & covers a lot of lakes. Also use the MN DNR lakefinder app.