Phil-I run a Lowrance HDS-7 on my Alaskan18'. I use the Chip for north region which covers Mn, Wis, Dakotas, and maybe more. What I like about this unit is that you can run full screen GPS if you want only navigation. I put the unit in my Polaris Ranger for ice fishing and use full screen GPS. Works great. These units are a little more spendy, but whatever unit you buy make sure you get a large enough screen so you can read it when moving at full speed. Hard to read small screens with wind in your face and you're trying to navigate in dark also. If you want to PM I can get you name of a reasonable dealer in Minn that could put you in the right unit for you.