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The GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.

As a positioning system, GPS allows users to map waypoints, tracking their position on a map to within a few meters of their exact location. Civilian use GPS systems are made by companies such as Magellan, Garmin and Trimble.


In 1998, Vice President Al Gore announced plans to upgrade GPS with two new civilian signals for enhanced user accuracy and reliability, particularly with respect to aviation safety.

When it was first deployed, GPS included a feature called Selective Availability (or SA) that introduced intentional errors of up to a hundred meters into the publicly available navigation signals, making it difficult to use for guiding long range missiles to precise targets. Additional accuracy was available in the signal, but in an encrypted form that was only available to the United States military, its allies and a few others, mostly government users.

Each satellite repeatedly re-broadcasts the exact time according to its internal atomic clock along with a digital data packet that includes the satellite's precise position, satellite status messages, and an almanac of the approximate position of every other active GPS satellite. The almanac lets GPS receivers use data from the strongest satellite signal to locate other satellites.

The GPS system uses a satellite constellation of 24 satellites in intermediate circular orbits. The orbits are designed so at least four satellites are always within line of sight from almost any place on earth. The constellation also includes three spare satellites in orbit.

The US military has developed the ability to locally deny GPS (and other navigation services) to hostile forces in a specific area of crisis without affecting the rest of the world or its own military systems. Such Navigation Warfare uses techniques such as local jamming to replace the blunt, world-wide degradation of civilian GPS service that SA represented.

GPS is short for (the) Global Positioning System, a satellite navigation system developed by the US Department of Defense. A fleet of more than two dozen GPS satellites broadcasts precise timing signals to GPS receivers, allowing them to accurately determine location anywhere on Earth. In practice, this means that using a GPS device, you can find out where you are in terms of longitude, latitude and altitude.

In late 2005, the US government introduced the first in a series of new generation GPS staellites offering new capabilities. Chief among these is a second civilian GPS signal called L2C for greater accuracy and reliability.

In 1985, ten experimental Block-I satellites were up. A complete "constellation" of 24 satellites was in orbit by January 17, 1994.

The most recent launch was in September 2005. The oldest GPS satellite still in operation was launched in February 1989.

Atomic clocks on the GPS satellites are set to "GPS time", which is the number of seconds since 00:00:00 UTC, January 6, 1980. UTC is short for Coordinated Universal Time. Today, GPS time is 14 seconds ahead of UTC, because it does not follow leap seconds. That's why new GPS units initially show the incorrect time after achieving a GPS lock for the first time. However, this is usually corrected on the display within 15 minutes once the UTC offset message is received for the first time.



1. OpenStreetMap - Wikipedia, the free encyclopedia
OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world. The maps are created using data from portable GPS devices, ...

2. Budget Travel Philippines | Living Asia Backpacking Guide ...
Free GPS Maps Download: Open Street Map and RoadGuide. Tutubi's got a ... There currently are two free GPS maps of the Philippines for download: ...

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Free shipping and low prices on DeLorme map software. Custom pocket pc street maps, palm os street maps, gps street maps, custom street maps, DeLorme ...

4. Free Routable Street Maps For Compatible Garmin GPS Units
Website with free worldwide routable streetmaps for Garmin GPS, from OSM data. Individual map tiles, or an executable for installation in MapSource.

5. GPS Maps : Hot Deals, 23%-82% off
Great deals on any GPS Maps type, street, nautical and topographical in the media of CD, DVD, flash memory & download. Prices range from $20 to $200 above. ...

6. Multimap.com
Welcome to Multimap - the online mapping company. ... Webslices - top maps, free tools and more. Find out more. explore and more. explore and more. take a closer look ...

7. Maps 'n Trails - free maps for Garmin GPS, Tools and more
Huge collection of links to free maps, tracks, tools and howtos. Suitable for Garmin GPS and similar navigation devices. As good, or better, than exensive commercial ...

8. NZ Open GPS Project
Synopsis: Free autorouting, street number searchable maps of New Zealand for Garmin mapping GPS. ... The maps are compiled specifically for the Garmin GPS platform as it ...

9. OSM Map On Garmin/Download - OpenStreetMap Wiki
fredericbonifas.free.fr. Fortnightly(ish) Yes. No. No. Also a relief map. France ... map for Germany and the Alps with contourlines. Easy installer for Garmin GPS, MapSource ...

10. Magellan GPS-Maps and Software
Enjoy worry-free driving with turn-by-turn guidance and the latest street maps. ... Looking for maps for older Magellan GPS vehicle navigation products? ...

11. Free GPS Software | Free GPS Maps | Cell Phone GPS | GPS ...
Comprehensive database of Free GPS software and Maps, free gps map software, free Garmin maps, free gps downloads and providing latest information on new gps units.

12. Free GPS Software
If you're looking for free GPS maps, Travel By GPS has many from around the world. ... This includes free street level mapping for all the USA. ...

13. GPS Maps: Enhance Your GPS Experience with GPS Maps
GPS Maps - What are they, where can I find them for free, and how do I buy?

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FREE NEW ZEALAND AUTO ROUTING ROAD, WALKING TRACKS MAPS WITH CONTOUR / TOPO ... was very happy to download a free GPS map of Western Samoa for his upcoming trip ...

15. Sources For Free Garmin .img GPS Map Files
GPS Vector Map Morocco has Garmin maps for Morocco and Western Sahara. ... a website which collects all free maps for Garmin GPS which are available on the Internet: ...

16. Free GPS Software for Mobile and Other
A complete, up-to-date source for free GPS software for Java, Symbian, Palm, BlackBerry, iPhone, Psion and more

17. Free GPS Maps | GPS Software Hub
Updated list of free gps maps for use with garmin, tomtom, magellan or other gps devices from various map sources along with download links for each of the free gps maps.

18. Travel by GPS Map of Boston Massachusetts USA
Download the free GPS Map in GPS eXchange (.gpx) file format, which can be read and ... If you have Street Atlas click here to download a more comprehensive map in (.dmt) file ...

19. GPS in India | Main / Maps
Google Maps with GPS : Free Google Maps Mobile service with a GPS enabled phone. ... Open Street Map: OpenStreetMap creates and provides free geographic data such as ...

20. GPS maps of all kinds
There are MapSend Street maps for the USA, Canada and Europe. ... Free GPS Maps. If you want to download free GPS Maps for hiking, fishing, snowmobiling, on ...

21. Free Shipping - DeLorme Street Atlas USA 2010 Map Software
Free shipping and low prices on DeLorme map software. Custom printable maps, custom street maps, street map software, delorme mapping software, and ...

22. Earthmate GPS BT-20 w/Street Atlas USA 2010 PLUS - BUNDLE ...
Earthmate GPS BT-20 w/Street Atlas USA 2010 PLUS - BUNDLE. GPS the way you want ... Add a DeLorme Bluetooth GPS for use with Bluetooth PDAs and navigate wire-free. ...

23. Fugawi GPS Mapping Software - Free software downloads and ...
Fugawi Global Navigator and Fugawi Marine ENC (the marine version)are the ideal PC software tools for route planning, GPS programming, and real-time GPS navigation on ...

24. Google Maps Street View GPS Review
Today we can show how something like that might look through Google's new feature, Google Maps Street View. ... Feel free to post that info in the forums, but not here. Name ...

25. Free GPS Maps Software for Navigation and Tracking
Free and Open Source GPS Maps and Software for Navigation and Tracking

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... Free Shipping - 3.5-inch Navi-GPS MP3/MP4-Capable with 2GB SD Card and US Street-Level Map (GPS Gadgets Electronics) with free worldwide shipping! ...

27. Welcome to the OpenMaps Project site! | Open Maps Project
my project make downloadable free maps about Austria, Bosnia-Herzegovina, Croatia, Czech Republic, Poland, ... A street map segment of Banska Bystrica ...

28. Global Navigator Home Page - GPS Navigation with GPS tracking ...
Global Navigator=3D GPS Navigation all over the world + Offline map and satellite image + Map range download+ 3D street view + GPS tracking + GSM tracking + Custom ...

29. Street Atlas USA 2010 - DeLorme
"The new 2010 version of this GPS mapping program is much easier to use for first-time ... 40 of free aerial imagery now included with the Street Atlas USA 2010 ...

30. Travel By GPS.com
GPS Maps and Tour Guides. Search this site to find and download hundreds of free GPS maps and tour guides for on- and off road sightseeing. ...

31. PocketPC GPS and Navigation
All you wanted to know about wince and pocketpc GPS usage and navigation. ... Street Atlas handheld provides support for US street level maps and can route on the PDA. ...

32. TomTom: Portable GPS Car Navigation Systems
Features TomTom's line of portable GPS car navigation systems. ... Spoken instructions & street names *Lifetime Traffic & Map Updates are included with T, M & TM products (see ...

33. Magellan offers Free Map Card for Roadmate 300 Owners GPS Review
Best GPS. Ethics. Testimonials. Contact. Magellan offers Free Map Card for Roadmate 300 ... a free 256 MB Secure Digital memory card containing detailed street maps of their region ...

34. Worldwide routable Garmin maps from OpenStreetMap
Free worldwide routable Garmin maps from OpenStreetMap, available in MapSource, RoadTrip and gmapsupp formats. ... Free routable maps for Garmin brand GPS devices ...

35. TopoFusion.com | GPS Mapping Software for Windows
Analyze GPS data using topo maps, 3D, color aerial photos and satellite imagery. GPS playback and advanced features for athletes. ...

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