Thanks Trailrunner. That link is interesting.
Do you know if there are any sites that have trail maps that can be downloaded onto my Colorado?

I have the 300 model(so I could have the map CD to print out topo maps of areas I want). I think it's a bit more versatile than the pre-loaded Colorado 400t.
With a 4 Gb Ultra SD card that I bought you can load a LOT of maps and then load more on another card, if necessary. I have all the western U. S. to the Mississippi on that one card.

I've noticed a friend's Oregon doesn't seem to have the ability to get satellites in canyons as well as my Colorado. Seems my older tech "Quad Helix" antenna is better than his ceramic antenna.

Eric