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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.


GPS derives in part from its predecssor, the LORAN navigation system. LORAN was designed for ship and airplane navigation in the 1940s for use during World War II.

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.

Because GPS is as much an accurate time keeper as a locator, one of the most common applications for GPS units is as a reference clock for time code generators or NTP clocks. For instance, when monitoring earthquakes, each seismic sensor can be synched with the GPS system to provide a synchronized, precise time source for measurements.

Commercial civilian GPS receivers are purposefully less accurate than they might be. In specific, they are required to have limits on the velocities and altitudes at which they will report coordinates in order to prevent them from being used to create improvised missiles.

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.

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.

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.

GPS receivers calculate their current position (latitude, longitude, elevation), and the precise time, using the process of trilateration after measuring the distance to at least four satellites by comparing the satellites' coded time signal transmissions.

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.



1. Car Rental GPS Comparison
DriveSmart GPS Hire Australia - hire the latest GPS system in-car satellite navigation (sat nav) units. Don't buy one, rent one from Australia's First Rental GPS Service!

2. Top 10 Car GPS Systems in the UK!
Here is a review of the top 10 portable car GPS navigational systems ( or Sat Nav's) as reviewed by a popular UK consumer magazines, by asking average families to try ...

3. Find the Best Car Navigation and GPS Reviews and Ratings
Information and reviews on the latest and best GPS Navigator on the market today. TestFreaks has all the reviews to help you find the best GPS Navigation.

4. Car GPS (Navigation) - CNET Reviews
... gps (navigation) reviews, CNET editors' ratings, user reviews, and prices on car gps (navigation). Find the car gps (navigation) that's right for you. ...

5. Gps Comparison
The market for car gps navigation has gone up a gear from the highly technical systems ... If you want to do a GPS comparison then these are the things you should look for when ...

6. Cheap car gps| Buy cheap car gps products and compare prices ...
When you want to buy cheap car gps online, visit us for cheap car gps from all famous brand names.

7. TomTom 340 Car GPS - Compare features, specifications and ...
TomTom 340 Car GPS $299 - 4.3" GPS Navigator with a screen resolution of 480 x 272 pixels, 3 hour battery life, 1yr warranty. ...

8. TeleNav Comparison to In-Car GPS Systems GPS Review
In the TeleNav demo they compare themselves to traditional In Car GPS systems. ... They say in car GPS systems will cost about $200 to update. ...

9. Buy GSP Comparison Reviews - GPS Hot Deals, Best Prices and ...
Buy GPS Comparison Reviews: Portable Garmin, TomTom, Magellan, Nextar, Sony..How-to, Tips and Best Hot Deals!. www.BuyGPSComparison.com

10. TomTom 950 Car GPS - Compare features, specifications and ...
TomTom 950 Car GPS $649 - 4.3" GPS Navigator with a screen resolution of 480 x 272 pixels, 3 hour battery life, microSD slot. ...

11. GPS Comparison - Compare Car Navigation Systems from $ 200 to ...
GPS Comparison, Compare these GPS systems - Car Navigation Systems from $ 200 to $400. Find the best GPS for you at GPS Genie, GPSGenie.com.

12. GPS Car Navigator screen Comparisons
SCREEN Readability Comparisons for some Popular GPS Car Navigators ... We placed all these instruments on our car dash at one time so they were approximately in ...

13. Independent Reviews of Consumer GPS Systems
Reviews of In-Car GPS Systems. Best Car GPS System all around. The Garmin Nuvi 760 is one ... Car GPS System Reviews Copyrighted © by 2009 GPS Consumer Report All ...

14. Navman GPS - Car Navigation SatNav - Lowest Prices Revealed ...
Grab The Best Deal On NavMan GPS Systems. While Stocks Last As Offers Are Time Limited.

15. GPS Comparison - Compare Car Navigation Systems from $ 401 to ...
GPS Comparison, Compare these GPS systems - Car Navigation Systems from $ 401 to $500. Find the best GPS for you at GPS Genie, GPSGenie.com.

16. Price Comparison for Car & GPS. Compare Prices and save.
Price comparison for Car & GPS. Compare prices and save.

17. Best Car GPS - Reviews & Buying guide | Garmin, TomTom, Magellan
Best Car GPS - Reviews & Buying guide | Garmin, TomTom, Magellan. Find very Best Deals Prices. Buy Cheap car GPS.

18. GPS Comparisons, Garmin GPS Comparisons, Magellan GPS Comparisons:
GPS Comparisons, Auto GPS Comparisons, Portable GPS Comparisons, Garmin GPS Comparisons, Handheld GPS Comparisons

19. car gps - Compare Prices and Buy on Shopping.com
Shop for car gps. Price comparison, consumer reviews, and store ratings on Shopping.com

20. Car Gps - GPS: Find, Compare, Read Reviews & Buy Online ...
Yahoo! Shopping is the best place to comparison shop for Car Gps - GPS Compare products, compare prices, read reviews and merchant ratings.

21. Car GPS - Price comparison site - Twenga.com.au
Find Car GPS Compare prices in Australia and get the best deals for Car GPS from thousands of shops on Twenga.com.au.

22. GPS comparisons
Put their Bluetooth GPS device anyplace in the car and it will transmit data to your ... It's easier to find info about individual GPS products than about GPS comparisons. ...

23. Compare GPS Sat Nav systems|car satellite navigation systems ...
GPS Compared brings you the best online prices and deals for GPS navigation systems in the UK. We compare Sat Nav prices from the leading UK retailers to ensure you ...

24. Travel By GPS Comparison
Which is the best GPS receiver for GPS Tours, hiking, boating, and car navigation. Here are the GPS units I reocommend.

25. Prices IN-CAR GPS Compare prices comparison prices
In-car GPS GPS & Sat Nav GPS & Sat Nav ... TomTom GPS Go 730 T Eurooppa. Näyttö 4,3" (10,92 cm) kosketusnäyttö, TMC Premium-liikennetiedotukset (elinikäinen liittymä), Bluetooth ...

26. GPS Reviews and GPS Comparisons
GPS Reviews and GPS comparisons of several car GPS and handheld GPS units at GPS-Planet

27. Rental Car Gps Face Off: Hertz Vs. Avis - Product Comparisons
Garmin gps comparisons. Rental Car GPS Face Off: Hertz vs. Avis compared to competitor and like products.

28. Compare Car navigation GPS-Receivers Prices - PriceRunner ...
Compare prices on GPS-Receivers among retailers, read user and expert reviews and use our easy price comparison to help you find the best deal online at PriceRunner

29. GPS Reviews - GPS Review and How-to for Car, Handheld, and ...
GPS reviews, ratings, and how-to. Garmin and TomTom car GPS, handheld GPS, sports and fitness GPS reviews. News, products, trends.

30. In Car GPS Systems - Compare Prices and Deals, Shop & Buy ...
Read In Car GPS Systems Reviews, Price Comparison and Store Ratings. Compare In Car GPS Systems and buy from the best Australian stores at MyShopping.com.au

31. GPS Comparisons
GPS Comparisons. GPS Comparison. GPS comparison can drive any sane person mad. ... mount, enabling you to find your car. Cool.The garmin gps also provides traffic updates ...

32. Compare Auto GPS - Auto GPS Comparison
Auto GPS are compared by ConsumerSearch, which evaluates features, pros and cons, and differences in prices of Auto GPS along with other factors.

33. car gps - Compare Cheap car gps Prices & Save shopping in ...
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34. Magellan
Specializing in satellite navigation and communication products. ... Refurbished GPS devices now available! Magellan Premium Car Kit ©2010 MiTAC International Corporation. All ...

35. GpsPasSion Forums - In Car GPS Reviews/comparison
But what I would say is the new generation of in-car GPS would win with the voice command. ... The comparison is quite welcome here and I'll be happy to host an ...

36. Car GPS Review & Auto GPS Review
Read about various car GPS units and learn how to set up and use GPS for your car. Download map or manual for your GPS for car unit. ...

37. Compare Garmin nuvi Portable Car GPS Systems at GPS Central ...
Compare nuvis on comparison chart - the main features of these GPS ... All nuvis are portable car GPS units, so they can be moved from car to car or go for a ...

38. GPS Unit Reports - Fact Based User Reviews & Reports
Fact based consumer reviews of vehicle and car GPS personal navigators. Comparisons of all the top selling GPS models and recommendations for the best places to buy.

39. How to Buy GPS - GPS Price and Feature Chart
How to shop for a car gps, and a detailed chart comparing GPS features. How to get the best prices and features. ... Price and Feature Comparison Chart for In-car GPS ...

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