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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 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.

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 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).

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 is coming into common use in cars these days. Most new cars allow you to purchase GPS technology that will help you plot your trip from one location to the next.

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

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.

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 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. Best 5 GPS navigation systems - CNET Reviews
CNET Editors choose the 5 best GPS navigation systems, including Garmin GPS, Magellan GPS, Tomtom GPS, and other GPS systems and GPS devices.

2. Car GPS (Navigation) - CNET Reviews
Find the car gps (navigation) that's right for you. ... on almost every front, but the portable navigation system hits a speed bump with its sluggish performance. ...

3. Mio Technology C720t Car GPS Navigation System GPS Review ...
Mio Technology C720t Car GPS Navigation System GPS review and complete Mio Technology C720t Car GPS Navigation System GPS coverage including, lab tests, ...

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Car Navigation System - 614 results like the Rosen TOYOTA SERIES In Dash TOYOTA SERIES 6.5" LCD, Plug & Play, Rosen GM SERIES CP In Dash Nav 7" LCD, ...

5. Garmin StreetPilot C340 Car Navigation GPS Review
Garmin's products are well worth considering if you're looking for the best car gps system for your money. ... Our review of Pioneer's AVIC-S1 Portable GPS Navigation System ...

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Satellite Navigation System: Read Expert Reviews, Compare Prices of Sat Nav, GPS systems. Compare prices and read reviews of TomTom, Megallan, Viamichelin, Garmin, ...

7. Best Car Gps System Review
Unbiased gps system review, helping you to find the best car GPS system as well as other GPS navigation and tracking systems such as handheld GPS and blue tooth GPS.

8. Navigation System - GPS - Car Audio & Electronics Magazine
... a "good" thing is because GPS-based navigation system gets almost a five-fold increase in accuracy with existing equipment...

9. Auto Navigation GPS Reviews
GPS Navigation reviews for autos, review the best GPS systems for navigation on today's roads, reviews of Garmin GPS, Magellan GPS, TomTom GPS, GPS ...

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Find your way to the best car GPS navigation systems news and reviews site.

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Looking to buy GPS? Your one stop and main source for GPS navigation reviews. Read our reviews and make a sound decision!

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Car Gps Navigation Reviews - get more information here The information in the article below comes straight from well-informed experts with special ...

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Compare Car Navigation Systems, discounts review and more

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TomTom One 140 GPS Navigation System. Best Offer! $94.99. TomTom ONE ... 3.5-Inch Portable GPS. Best Offer! $199.99. Car GPS Navigation Reviews. home sitemap rss ...

16. Clarion MAP 670 GPS Navigation System Review | Compare GPS ...
A review on Clarion Map 670 Car GPS system. This portable GPS navigation system features 4.3" touch control display, bluetooth, MP3, photo viewer and more.

17. GPS System - A Guide to Making the Right Purchase
GPS system.com is here to help you understand the basics of GPS navigation, and find your ... With the right GPS navigation system, you can know exactly where you ...

18. How to Buy the Best GPS System: Shopping for Navigation Units ...
GPS navigation units come in many different varieties - GPS car units, navigation units for hiking, boating and flying. Learn how to buy the best GPS system.

19. Car GPS Navigation Systems and Reviews
Welcome to the Car, Mobile GPS Navigation Systems web site. ... Whether you're looking for your first GPS Navigation System or looking to upgrade, you're sure to find some ...

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Published by admin under Car GPS Navigation Review. Tons of reviews for practically every product can be found on the Internet in a few seconds. ...

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GPS navigation car audio and video system with a 7 inch touch screen LCD and Bluetooth for maximum driving utility. Be the first in your circle of ...

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Save More on Brand Name GPS Devices with Walmart's Unbeatable Prices. GPS Navigation System. Get GPS and Leading Edge Tracking. (Page 1)

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GPS SatNav System Reviews, the very latest satnav systems and GPS car systems to help you find your way reviewed by lordpercy.com

24. Car GPS (Navigation) - | ZDNet: Reviews
Find unbiased reviews for Car GPS (Navigation) at ZDNet Reviews. Select and compare various Car GPS (Navigation) features and prices from authorized ...

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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.

26. GPS Satellite Navigation Systems Reviews, Articles, Tomtom ...
GPS Satellite Navigation systems have never been more affordable, but the choice of which Sat Nav to buy can by intimidating. Use our articles and reviews of Tomtom, ...

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GPS Navigationfor the best prices, guaranteed! $2.95 shipping and product reviews on your entire order.

28. Delphi NA10000 Mobile Navigation Review
Delphi NA10000 Mobile Navigation Review, GPS, Global Positioning System, Navigation, Inertial Navigation, GLONASS, Car Navigation

29. GPS Navigation Reviews
GPS Navigation Reviews and User Ratings. Comparison of all GPS Navigation devices in the market, with Reviews and Rankings

30. gpsinformation.net
Information, software, and hardware reviews of name brand GPS receivers and PDAs, plus instructions, software, and tutorials.

31. GPS car navigation review and compare with Choice.com.au
GPS car navigation review and compare product information for consumers in Australia. Research buying guides, surveys and independent consumer reviews ...

32. Garmin Nuvi 350 Car GPS (Navigation) reviews - CNET Reviews
CNET's comprehensive Garmin Nuvi 350 coverage includes unbiased reviews, exclusive video footage and Car GPS (Navigation) buying guides. Compare Garmin Nuvi 350 ...

33. Review of Garmin Street Pilot Portable Car GPS Navigation ...
The portable GPS navigation systems offered by companies such as Garmin have revolutionized business and personal travel. Read this review to learn the pro's and ...

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More new cars are shipping with the optional GPS navigation systems: learn which ones are on top of the pile, according to J. D. Power.

35. Car GPS Navigation Systems - Car Electronics
Please browse our GPS for prices and models, review them, and buy for cheap wholesale prices. Car GPS Navigation Systems can be used through traffic day-to-day or ...

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car gps navigation systems reviews and recommandations ... In this article, we will review the best free online GPS tools useful for different applications of GPS technology. ...

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