GPS Drawing - A collection of drawings made with GPS data logging devices. GPSBabel - Free multiplatform software converts waypoints, tracks and routes from consumer GPS receivers and popular mapping programs, and allows the data to be manipulated. Handles many file formats. USCG Navigation Center - GPS, DGPS, LORAN-C, OMEGA, navigation systems, GPS navigation, DGPS navigation. GPS Status Information from US Naval Observatory - Via ftp. 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 Kwajalein - GPS Ground Station on Kwajalein Island, photographs of the island and site. Links to others GPS sites. Outdoor Gear Reviews - GPS receiver comparisons. Internet-based Global Differential GPS - C-language software package for GPS-based real-time positioning and orbit determination. Includes system overview, technical papers, and a live demo . GPS Site from Univ of Texas - Global positioning system overview and bibliography. GPS Information - Mehaffey, Yeazel and DePriest's site provides dozens of reviews and technical articles on GPS receivers and software, and a huge list of links. Chartracer Software - Cartographic Software is for making moving maps on which GPS data from a serial port are plotted. Data are tracked remotely via CDPD modems and internet sites. GENESIS - Suite of data services that brings together the new Earth science products to be produced by spaceborne Global Positioning System (GPS) receivers. It serves mainly as a database for GPS occultation observations. RLA GeoSystems - Source for GPS information and training. Trimble ProXRS and GeoExplorer3 receivers, top 10 websites, GPS for educators and free help. GPS by Globespotter - GPS education, news, hardware, software, and links. Digital mapping. Standford University GPS Research Laboratory - Technical and academic papers on GPS technology with a special emphasis on its use in aviation and marine applications. GPS Forums - Technical and consumer discussion on GPS technology. Lowrance Electronics: GPS Tutorial - A tutorial on GPS technology and how it works. OkMap - Software for Windows XP or later that works with digital maps bought or scanned. Imports vectorial and DEM data and also can interface Google Maps and Google Earth.