The number of posts regarding GPS, mapping, use of maps, etc has grown a bit. Rather than having the "corporate knowledge" spread around throughout the forum, we'll give it a home.
We have users of various experience with GPS and mapping here. I hold a geomatics degree and have used GPS units all over the world, from recreational little strolls with a $100 Etrex in my pocket, to professional work where helicopters took us far back in some of the wildest parts of the planet with a $70,000 RTK unit doing surveys for mining claims. Others here have done extensive ride reports in various places featuring very nice GPS tracks indeed. So among our members, we have some experience and a pretty good school of personal experience to lean on.
The capabilities of both recreational GPS units and the mapping software that can use that data is increasing so fast it is hard to keep up with it. Enjoy.