I have an old Vexilar LC-10 Boundary Waters portable that I'd be willing to get rid of.  I googled it, and they don't sell it any more but I used it successfully in the Quetico for a few years.  It runs on AA batteries, is b/w, and very light.

I haven't been on this site in years, but I thought I'd re-join.  I just bought a fishing kayak and will be spending May and June on non-BWCAW lakes off the Echo trail.  I put a Humminbird Helix 7 G2N on it, so I will be autocharting some lakes that haven't been graphed since the 1950's.