I have always wondered what others use for the Quetico but for the Boundary Waters I use Garmin etrex legend HC.  Don't need any topos.  I simply got all the waypoints for the campsites and portages for free and downloaded the program Easygps which sends them to my gps.  Right before every trip I get out my maps and write the campsite and portage numbers on the map for my whole trip.  I then download them into my gps using Easygps program.  This process takes me less than 30 minutes.  If I don't know where I am I just turn on my gps and the campsites or portages will show up on my screen.  For example, I can bring the scale down to 200 feet on my screen and know that a campsite is 200 feet straight west of me and I can look at the map and know exactly where I am.  I assume for more remote locations (Quetico & etc.) you simply must pay for the mapping software sold by the gps companies.