Man, this is a beautiful report!
If this isn't posted in the GPS forum, it should be:
The GPS is a truely wonderous thing. Out here in the desert lay some abstract points I had never visited at which I was supposed to adjust my direction. We could ride right up on the waypoint and not see the road until we stopped and took a minute to look around. This is where I had discovered the excellent quality of the "stacking maps" (for lack of a better name) in my 276C. I had both City Navigator and Topo USA loaded onto the memory card. Since most of the route was actually shown in City Navigator, I could "turn on" that map, use the "autoroute" function to establish the turns, then "turn off" Navigator to look at the Topo maps. Because the route had been established in Navigator, it continued to show, overlayed onto the Topo maps without having to recalcualte to the "off road" setting- which is the only setting avaiable in the Topos.
Great to know!