dasilvarsa:
Your suggestion worked well. The only thing I did differently was I sent the trail maps and overlapping topo maps to a usb flash drive. I then found and set the MS flag to 0 as you suggested in Gmaptool.
When I opened up Basecamp the USB was recognized. I opened up gmapsupp.img (in the garmin folder) and then was able to view the trails maps superimposed on the topo maps.
Great suggestion. Thank you for your help.