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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.


Most ships and airplanes are equipped with GPS systems so that they can accurately plot on a map where they are. In planes, this is especially useful during bad weather, and in ships in knowing where shallow water and other sunken obstacles may lie.

In 1996, President Bill Clinton issued a policy directive declaring GPS to be a dual-use system, meaning that it could be made avilable for a wide range of civilian and military purposes.

The United States Department of Defense developed the system, officially named NAVSTAR GPS (Navigation Signal Timing and Ranging GPS), and the satellites are managed by the 50th Space Wing at Schriever Air Force Base. Although the cost of maintaining the system is significant, GPS is available for free use in civilian and commercial applications.

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

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.

Hand-held GPS units are often used by hikers and mountain climbers to plot their courses and to accurately reflect exactly where they are. The author once used GPS to organize a helicopter evacuation of an injured motorcycle rider in a remote region of the La Sal mountains in Utah. A reading was taken, coordinates given, and the pilot was able to find us with ease.

GPS signals can also be affected by multipath reflections of the radio signals off the ground and/or surrounding structures (buildings, canyon walls, etc). For long delay multipath signals, the receiver itself can filter the signals out. A variety of receiver techniques, most notably Narrow Correlator spacing, have been developed to mitigate multipath errors.

Selective Availablity typically added signal errors of up to about 10 m horizontally and 30 m vertically. The inaccuracy of the civilian signal was deliberately encoded so as not to change very quickly, for instance the entire eastern US area might read 30 m off, but 30 m off everywhere and in the same direction. In order to improve the usefulness of GPS for civilian navigation, Differential GPS was used by many civilian GPS receivers to greatly improve accuracy.

The author would have loved to have used GPS years ago in college. We had a class where we used maps and compasses. We were given precise coordinates and had to plot a course through woods and streams and swamps to find and sign in at specific latitude and longitude coordinates. Today, this sport, now called "geocaching", is a popular activity, particularly for outdoor hiking enthusiasts.

GPS was first made available for commercial applications in 1983, after the Soviet Air Force shot down the civilian airliner KAL 007 in restricted Soviet airspace, killing all 269 people on board.

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.

One of biggest problems for GPS accuracy is that changing atmospheric conditions change the speed of the GPS signals unpredictably as they pass through the ionosphere. The effect is minimized when the satellite is directly overhead and becomes greater toward the horizon, as the satellite signals must travel through the greater "thickness" of the ionosphere as the angle increases. Once the receiver's rough location is known, an internal mathematical model can be used to estimate and correct for the error.

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.



1. TomTom
GPS solutions for your Car, Motorcycle, PDA and mobile phone - The smart choice in personal navigation.

2. GPS Tracking Systems, Fleet Management and Scheduling ...
Trimble delivers leading Mobile Resource Management solutions including GPS tracking systems, dispatch software, scheduling software and asset management to improve ...

3. GPS Navigation Systems Windows mobile Mapping Software Mobium
Mobium GPS software Turn a GPS Windows Mobile device such as handheld, palm smartphone into a full gps navigation systems download free trial.

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Buy GPS Software - Mobile Store - US online store for Mobile Devices - Buy PDAs, Laptops, GPS, Cell Phones, Gadgets

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Shop Windows Mobile GPS at the WMExperts Store - including GPS Car Kits, GPS Receivers, GPS Software, GPS Bundles

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MOBIUM GPS Smartphone software downloads Free Trial windows mobile GPS Navigation System and turn your mobile PDA Handheld smartphone into a full navigation systems

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Mobile GPS Online is a mobile GPS products and services firm, with expertise in system integration and application software development utilizing Global Positioning ...

8. Windows Mobile GPS Software
GPS Map Software for Windows Mobile, Windows Mobile GPS Software for United States. Arkon recommends PocketMap Navigator 2009 for your Windows Mobile Phone. ...

9. How to Install Mobile GPS Software | eHow.com
How to Install Mobile GPS Software. GPS, officially named NAVSTAR Global Positioning System, was developed by the United States Department of Defense for military ...

10. Mobile Garmin Software - GPS Central U.S.A.
Mobile Garmin Software ... Data Cards Garmin GlobalSat Instructional & Reference Lowrance MapSource Maps and Charts Mounts On Sale PocketMap Software TOPO Maps. Cables ...

11. PDA Games and Software
PDATopSoft - Symbian freeware, Blackberry software, Windows Mobile Smartphone, software for Palm Treo, iPod and iPhone. PDA Software, games and applications for ...

12. IP Tracking Software : Mobile Phone Tracking : Geo GPS Location
Based on repeater triangulation, the system tracks mobile phones using GPS and GSM technology ... 25 meters (max.) for mobile phones in the U.S.A., South America and Canada. ...

13. Smartphone GPS software from Garmin LetsGoMobile
GPS software ... Once the card is inserted into a compatible smartphone with embedded GPS, the Garmin Mobile XT application will launch automatically. ...

14. Loadstone GPS - Satellite Navigation for blind mobile phone users
This web site hosts information relating to Loadstone GPS - Free satellite navigation software developed for Symbian Mobile/phones using the Series60 platform. ...

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Shop Windows Mobile GPS at the WMExperts Store - including GPS Software, GPS Bundles, GPS Car Kits, GPS Receivers

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mobile software for pocket pc, smartphone, pda, BlackBerry, Symbian devices. Inclusing TV, radio, video, GPS, LBS, map, direction and more.

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Windows Mobile Palm PDA Pocket PC Handheld and Smartphone MobiumGPS software Download Free Trial

18. GPS in India - Main - Software
GPS Software for mobiles and PDA ( Nokia N95 / Blackberry / HP iPaq ) ... GPS Tuner: Revolutionary 3D off-road navigation software for Pocket PC and PDA ...

19. GPS Software - Garmin, TomTom Navigator, iGuidance ...
GPS Software NOTE: Software are not refundable. Optional GPS Receiver is required if your device does not already have GPS capability.

20. gps news, reviews, software and freeware - MobileTopSoft.
gps smartphone software and freeware reviews, guides and downloads for all Windows Mobile phone, Android, BlackBerry and Symbian OS. Free software including medical, ...

21. GPS Test 1.04 Software for Windows Mobile/Pocket PC ...
GPS Test - Windows Mobile (Pocket PC) Smartphone software and freeware Pocket PC games for WM5 and WM6 phones. Applications for Smartphone 2002/2003/2005 and WM5 ...

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... GPS Systems, GPS Receivers, GPS Navigation, GPS Tracking, Car GPS, GPS Software for Mobile Phones, GPS Solutions Store Description Store Description ...

23. GPS Software
Mobile Fun sell a huge range of GPS Software, Bluetooth Headsets, Cases, Chargers, Batteries and more. Great value & FAST delivery - Order Now!

24. Sygic, car navigation for iPhone, Android, Symbian, Windows ...
Sygic GPS navigation software | for mobile phone, oem, car, fleet, PDA:

25. Garmin Mobile PC Software With GPS 20X Sensor
The Garmin Mobile PC Software With GPS 20X Sensor is featured in Automotive GPS > Garmin Automotive GPS. Find the Garmin Mobile PC Software With GPS ...

26. Blackberry GPS Tracking Software | Mobile GPS Tracker Phone ...
The Executrac Mobile Phone GPS Tracker Software turns your Blackberry or smart phone into a personal GPS tracking beacon. Get real-time location ...

27. NavMobile | Windows Mobile Software
Download free GPS & Navigation software for your Windows Mobile/Pocket PC device. Windows Phone 7 Series software coming soon! ...

28. Garmin Mobile XT Software Only for Smartphones
Receive the latest product updates and specials from Tiger GPS (we won't share your email address with anyone else!) Home Garmin Mobile XT Software ...

29. Free Pocket PC GPS
Get the excellent compilation of free GPS applications for your Windows Mobile powered devices. Windows Mobile GPS software offers a variety of pocket PC GPS maps and ...

30. RNS:: Calorie GPS Software for Windows Mobile
The official web site of RNS:: Calorie GPS for Windows Mobile - Track your caloric consumption during your everyday activities or sports!

31. 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

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Free Windows Mobile software for GPS tracking, navigation, mapping, geocaching, sports, golf and hiking with pocket pc, PDA, smart phones, bluetooth ...

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Free mobile GPS software ... Phoneit is offering consumers a free mobile navigation and mapping application based on the emerging ad-funded business model. ...

34. Fastrax Debuts Software-based Mobile GPS Receiver | GPS World
Finnish GPS receiver maker Fastrax Ltd. is squarely taking aim at the mobile market, having unveiled a completely software-based receiver. Only requiring an RF front ...

35. PathAway Home
Off-Road GPS navigation and tracking software for Windows Mobile, Symbian and Palm OS Smartphones and PDAs. Create a customized personal moving map ...

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