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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.


More accurate GPS receivers are used these days in surveying to accurately locate boundaries, structures and so on.

GPS receivers come in a variety of consumer formats, and today can be found in cars, watches, phones boats and planes. Major manufacturers include Trimble, Garmin and Leica, low-end, hand-held consumer units are often available at less than $100 per unit.

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.

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

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.

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

In early years, the US military made the civilian application purposefully less powerful than it could. But since August 2000, the GPS civilian application provides the accuracy of GPS signals to within 2 meters (6 ft). Fact is, GPS accuracy can be improved further, to about 1 cm (half an inch) over short distances, using techniques such as Differential GPS (DGPS).

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.

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.

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. Mobile phone tracking
GSM mobile phone tracking system via the GPS-TRACK satellite network. Based on repeater triangulation, the system tracks mobile phones using GPS and GSM technology ...

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Tracking people with cell phones requires the proper equipment, ... Your phone may have GPS and "know" exactly where it is, but it can't "tell" anyone else where you are unless ...

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Software that turns Motorola iDEN phones carried by Nextel (U.S.) or Telus (Canada) into a GPS tracking device.

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7. IP Tracking Software : Mobile Phone Tracking : Geo GPS Location
Welcome to our Phone Tracking Satellite System: GSM mobile phone tracking system via the GPS-TRACK satellite network. Based on repeater triangulation, ...

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... service that allows you to track a GPS-enabled cell phone online in real time. ... Please note that we disallow all forms of covert tracking. ...

9. GPS tracking unit - Wikipedia, the free encyclopedia
A GPS tracking unit is a device that uses the Global Positioning System to determine the precise location of a ... These usually use data push from a GPS enabled cell phone. ...

10. InstaMapper - Free Real-Time GPS Tracking
iPhone Tracking. InstaMapper is a free real-time GPS tracking service. For instructions on ... a device key and set up tracking on your iPhone, please follow this ...

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Welcome to our Phone Tracking Satellite System: GSM mobile phone tracking system via the GPS-TRACK satellite network. Based on repeater triangulation, ...

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It uses GPS Tracking and GSM to locate people internationally. The GPS Tracker is available for various models of Smartphones. ...

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GPS navigation and tracking on BlackBerry smartphones help make the most of your mobile life. Learn about built-in BlackBerry GPS features for tracking and navigation.

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Keep track of what's important with a personal locator beacon (plb) or GPS tracking device from GPS Central USA.

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Since 2005 Mologogo has provided free GPS tracking for thousands of enthusiasts in millions of locations ... smartphone with GPS, such as a Windows Mobile phone or Blackberry, ...

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GSM mobile phone tracking system via the GPS-TRACK satellite network ... We are not responsible for possible tracking errors that may occur. Use areas ...

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19. GPS Tracking Solutions / Trackem
Trackem is a real-time GPS tracking solution developed by Solutions Into Motion.

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GPS Track Phone is a Real Time Tracking Device used available and is a GPS Tracking Device or Unit.

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

27. Fleet Map - Cell Phone GPS Tracking & Mapping Provider
Fleet Map is a low cost, customizable GPS tracking, mapping, and messaging application. It is a system that has been developed with one goal in mind, to leverage GPS ...

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GPS Tracking Systems, Track any GPS from GSM or other phone number. Use internet and satellite technology

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Find GPS tracking systems for tracking fleet automobiles. GPS auto tracking systems for consumers and businesses

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Locate My Phone offers state of the art Mobile Phone Tracking Devices similar to Global Positioning Systems (GPS Tracking Devices)

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38. GPS Pet Tracking
For GPS Pet Tracking one needs a GPS receiver and a cell phone modem in one device

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Know the Status of Your Tracking Unit: - Use our web site to find out your unit's current battery strength, cell phone signal strength and GPS ...

40. GPS Fleet Management Tracking System - UTS
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