The Global Positioning System, usually called GPS, is the only fully-functional satellite navigation system. A constellation of more than two dozen GPS satellites broadcasts precise timing signals by radio to GPS receivers, allowing them to accurately determine their location (longitude, latitude, and altitude) in any weather, day or night, anywhere on Earth.
GPS has become a vital global utility, indispensable for modern navigation on land, sea, and air around the world, as well as an important tool for map-making, and land surveying. GPS also provides an extremely precise time reference, required for telecommunications and some scientific research, including the study of earthquakes.
Location and Tracking :: Telecommunications
Navigation :: Geomatics
Space :: Technology

Australian Global Positioning Systems Society - A free membership society to bring together the delegates, sponsors, and exhibitors for the Satellite Navigation Conference and to foster, develop, and assist the Global Positioning System disciplines.
Meta Description: [ Assists GPS disciplines; aids networking; runs satellite navigation conferences, seminars and workshops. ]
Cetus GPS - Navigation, tracking and field data collection software for PalmOS handhelds.
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.
David L. Wilson's GPS Accuracy Web Page - Global Positioning System Accuracy
Emily Programme - A system study researching the coupling of terrestrial positioning and the satellite-based positioning.
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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.
GIS Services - Specializes in ArcView GIS training and provides commodities, services and training for implementing and integrating solutions with GIS, GPS, AVL, internet mapping and satellite imagery.
Meta Description: [ GIS Services provides software and hardware, services, and training for implementing and integrating solutions with GIS, GPS, and imagery. ]
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GPS ActiveX - Download information into a Visual Basic application or web page. Garmin, Magellan, Navman or any NMEA 0183 enabled GPS supported. UTM, SPCS, British National Grid, and most other national coordinate systems supported. [Windows and Pocket PC].
Meta Description: [ Share one GPS to several applications ]
GPS by Globespotter - GPS education, news, hardware, software, and links. Digital mapping.
Meta Description: [ Globespotter is dedicated to making our world a better place through education, communications and action. ]
GPS Clocks for Computer Time Synchronization - Learn about how to use GPS for computer time synchronization. We offer a GPSClock (for computer use) that's accurate to a millionth of a second. Ideal for running a stratum one NTP server.
Meta Description: [ Using GPS (Global Positioning System) for time synchronization for less than $400. ]
GPS Control Base Station on Internet - GPS Base Stations located in New Zealand, Australia, and New Guinea. Download GPS data files for $40-$70 per day.
Meta Description: [ GPS and DGPS base stations on the internet. Download and manage GPS data files, digital maps, and more. ]
GPS Deformation Monitoring - Objective is the development of a system for rapid and inexpensive monitoring of unstable slopes, such as pit walls, earthrock slopes and dam walls using global satellite positioning technology.
GPS Discounts for Educators - GPS special pricing for Trimble GeoExplorer 3 and ProXR/XRS educator kits. GPS education and training courses. Tutorials to learn about the GPS system. GPS consulting and course development.
Meta Description: [ GPS educator discount prices for Trimble GeoXH GeoXT GeoXM ProXH ProXT Recon educator kits. GPS training courses. GPS system tutorials to learn. GPS consulting and course development. Authorized Trimble GPS dealer and Certified Trainer. ]
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.
Meta Description: [ GPS Information on Garmin, Lowrance, Magellan and other CONSUMER receivers ]
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.
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.
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 .
Outdoor Gear Reviews - GPS receiver comparisons.
Meta Description: [ GPS/Compass Reviews - GearReview.com ]
RLA GeoSystems - Source for GPS information and training. Trimble ProXRS and GeoExplorer3 receivers, top 10 websites, GPS for educators and free help.
Meta Description: [ GPS by RLAGeosystems is a one-stop source for GPS information, GPS Training, GIS information, GIS training, and Trimble GPS receivers, ESRI GIS software. Featured are Dick's 10 Best GPS Web sites, Dick's 10 Best GIS Web sites and Dick's 10 Best Map ]
Satellite Navigation and Positioning Group (SNAP) - SNAP is Australia's largest academic GPS research group specialising in high precision GPS technology and applications.
Meta Description: [ SNAP (Satellite Navigation and Positioning Group) is Australia's largest academic GPS research group specialising in high precision GPS technology and applications. SNAP provides a world-class laboratory environment for PhD students and academic staff to carry out basic and applied research, as w... ]
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 History of GPS - The history and 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.
The GPS Waypoint Base - Non-commercial project allowing the collection or submission of GPS waypoints.
Meta Description: [ The searchable GPS Waypoint Base is a free source for waypoint collections from all over the world. You can select any output format for the data to import it using any GPS application. ]
The National GPS Network - Resource from the UK Government intended for GPS-equipped surveyors, and Geographic Information Systems (GIS) developers who work with Ordnance Survey (OS) mapping. Includes the Passive Station Database, Active Station RINEX Data, and Coordinate Converter services.
Meta Description: [ This website is an essential resource for the precise Global Positioning System (GPS) user in Great Britain. ]
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.
Meta Description: [ Download free GPS maps waypoint coordinates (latitude, longitude) and tracks for hiking, fishing, snowmobiling, on- and off road sightseeing. Use this data with Garmin, Magellan, DeLorme, National Geographic, and Google Earth mapping appilications. ]
USCG Navigation Center - GPS, DGPS, LORAN-C, OMEGA, navigation systems, GPS navigation, DGPS navigation.
Meta Description: [ USCG Navigation Center ]
Wayhoo.com - Database of geographical waypoint information and utilities for GPS/GIS users.
Meta Description: [ Wayhoo - GPS Waypoints ]
Wing Way Systems - Navigation-Wonder, a shareware GPS mapping navigation software including voice response system [Windows].
Meta Description: [ GPS Navigation software for Windows based systems. ]
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