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GPS Precise Orbits 
Global Positioning System  satellite ephemerides ("orbits") information for the general public, from US NOAA. GPS precise orbits are derived using 24 hour data segments from the global GPS network. An informational summary file is provided to d 
http://www.ngs.noaa.gov/GPS/GPS.html 
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Travel by GPS 
Downloadable free GPS maps for travel adventures, self-guided tours, and outdoor activities.  Map data includes waypoints and routes for use with handheld GPS and car navigation systems. 
http://www.travelbygps.com/ 
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