I have been researching Global Positioning Systems (GPS) for use when mountain biking. I've got to tell you that it is not easy finding out about GPS. Even with the Web. The sites that have a lot of information about GPS are extremely hard to use. Anyway, I am trying to find out how I can use a GPS along with topographical mapping software to make maps of trails that are not currently mapped (for example, Little Difficult Run Stream Valley Park in Herndon, Reston, and Oakton).
So here is what I have found so far:
1) General GPS Information: The following sites provide some good information but be ready to spend some time:
http://gpsinformation.net/
http://www.gpsnuts.com/
2) GPS Receivers: It seems to me that the only viable options in consumer GPS navigation are from Garmin or Magellan. Each manufacturer sells several lines. The best lines for mountain biking appear to be eTrex from Garmin and SportTrak from Magellan.
3) Topographical (topo) Maps: As long as the GPS you choose has extra "on-board" memory or accepts SD memory cards you can add maps to the GPS. For mountain biking it is probably best to use topographical maps and not just street maps. Although Garmin and Magellan each have their own proprietary topo maps, I think there are better ones available from the following companies:
National Geographic
Delorme
I like the National Geographic maps because NG hosts a mapXchange service. This allows users to make trail maps and then share them with others.
Once I acquire some of these systems I will let you know how they work. Let me know about your experience with GPS or Topo maps!
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