Surf these sites: David L. Wilson''s GPS Accuracy Web Page -- Global Positioning System Accuracy Free GPS Software -- GPS Software from Sunninghill (GPSS) for automatic vehicle location & tracking, via radio, cellphone, or satellite. GPS Applications Exchange -- GPS technology usage world-wide is featured. GPS application stories are accessed by geographic regions. GPS tutorials are available to enhance understanding. GPS Kwajalein -- GPS Ground Station on Kwajalein Island, photographs of the island and site. Links to others GPS sites. 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 document the computation and to convey relevant information about the observed satellites, such as maneuvers or maintenance. Orbits generally are available 2 to 6 days after the observation. GPS Site from Univ of Texas -- Global positioning system overview and bibliography. GPS Status Information from US Naval Observatory -- Via ftp. GPS Today -- GPS news, information, product reviews, and software downloads. Garmin GPS FAQ -- Information about Garmin GPS units, links to other Garmin-related sites, and links to other global positioning system information resources. Global Positioning and Navigation Systems Division -- The Global Positioning and Navigation Systems Division''s unique, state-of-the-art GPS test facilities are used to provide cradle-to-grave navigation system support, including verification of commercial and government GPS receivers for year 2000 boundary, GPS epoch boundary, leap year boundary, and almanac week boundary concerns. Hyperbolic Positioning Algorithm -- An algorithm for obtaining an exact solution for the three dimensional location of a mobile given the locations of four fixed stations (like a GPS satellite or a base station in a cell) and the signal time of arrival (TOA) from the mobile to each station. From Ralph Bucher. Mehaffey and Yeazel''s GPS Information -- Dozens of reviews and technical articles on GPS receivers and software, and a huge list of GPS links. Navigation Center (Alexandria, VA) -- includes Local Notices to Mariners Outdoor Gear Reviews -- GPS receiver comparisons. Satellite Navigation and Positioning Group (SNAP) -- SNAP is Australia''s largest academic GPS research group specialising in high precision GPS technology and applications. Septentrio Satellite Navigation -- Dual frequency GPS & GLONASS, as well as EGNOS, WAAS and MSAT based on an in-house single baseband processor. The Global Positioning System: The Role of Atomic Clocks -- Story of how the Global Positioning System evolved from the development of the world''s most accurate timepieces, atomic clocks, by physicists looking into the nature of time. Adapted from an article written by MIT scientist Daniel Kleppner. Waypoint Wherehouse -- Waypoint Wherehouse facilitates the free exchange of mapping data for recreational use.
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