Very interesting and educational information in this thread. Thanks to all.
For U.S. GPS navigators, I have found a very good PC based (free) program called USAMaps at jdmcox.com. You download USGS quadrangle maps and can create Routes or Waypoints on the maps and upload them to your Garmin or Magellan GPS. You can also download tracks, routes, and waypoint from the GPS. You can also download satellite photomaps.
Of not much use to motorcyclists but good for auto use, you can real time track on the PC with the GPS "hooked up."
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