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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.


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.

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

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.

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.

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 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.

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.



1. 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 ...

2. How to Compare GPS Models Before Purchasing One | eHow.com
How to Compare GPS Models Before Purchasing One. Your first task in buying a GPS system is to determine what features you need. Follow these steps to compare GPS models.

3. Compare GPS
GPS Systems at Great Prices! ... Compare products, prices, and read our customer reviews.We carry all the major retailers at unbelievable prices many are at sale ...

4. Handheld GPS Comparison : GPS Handheld Navigation : GPS ...
Compare handheld GPS systems! In stock portable GPS navigation for land, air and sea. GPS Central specializes in Garmin, Magellan, TomTom, Lowrance, ...

5. 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.

6. Garmin: On the Trail Product Comparison
On the Trail comparison for outdoor products ... GPS 60. GPS 72. GPS 76. Mapping Handhelds. eTrex Legend eTrex Legend Cx. eTrex Venture® Cx. eTrex Vista® eTrex Vista Cx. GPSMAP® 60 ...

7. GPS Comparisons
When you're comparing GPS models, you want to get the most bang for your buck. GPS can range from less than one hundred bucks to up to a thousand dollars. ...

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A community about gps comparison. Tag and discover new products. Share your images and discuss your questions with gps comparison experts.

9. GPS Systems Comparison | Compare GPS Systems | 5 Best GPS Systems
Portable GPS comparison of the top 5 GPS Systems.Today's handheld GPS systems have incredible features that can prevent you from getting lost, or being ...

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WI DNR - Comparing Global Positioning System (GPS) Tools (02/09/01) 7 ... WI DNR - Comparing Global Positioning System (GPS) Tools (02/09/01) ...

11. GPS: Compare Prices, Reviews & Buy Online @ Yahoo! Shopping
Yahoo! Shopping is the best place to comparison shop for GPS Compare products, compare prices, read reviews and merchant ratings.

12. Garmin: On the Go Product Comparison
On the go comparison for mobile products. ... GPS III Plus * GPS V® * iQue 3200 * iQue 3600 * iQue M5 * StreetPilot * StreetPilot 2610 * StreetPilot 2620 * StreetPilot 2650 ...

13. Magellan GPS
Let us help you compare our Magellan GPS devices. Choose the category ... Choose any specific products to compare. For multiple selections, hold down the "Ctrl" key ...

14. Garmin eTrex, 72- 76-60 Handheld GPS Units Comparison Table ...
Compare popular handheld GPS units and GPS Central in Canada! Etrex, 60 series and 76 series outdoor GPS receivers - basemap, tracklog, waypoints, ...

15. Compare GPS-Receivers Prices - PriceRunner United Kingdom
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

16. GPS COMPARISON
Compare Gps Prices ... Designed for two wheels, the TomTom Rider 32MB GPS Navigator for Motorcycles and Scooters is rugged and water resistant, and provides you with ...

17. GPSMatrix::GPS Comparison::Top Garmin GPS Units
GPS comparison and review. Top Garmin GPS units compared ... GPS is a convenient, fast and easy way for finding the best route or identifying current location. ...

18. Best GPS Device Reviews
Find the best and worst user reviews of GPS Devices. Wize has read 100,622 GPS Device reviews from 110 sites. Get reviews on the most popular brands ...

19. USB GPS Comparison
USB GPS Comparison. USB GPS receivers are devices that need to be connected to the USB ... It is a GPS receiver contained within a plastic housing with a cable ...

20. Gps Comparison
If you want to do a GPS comparison then these are the things you should look for when comparing such models as TomTom, Navman, Mio and Garmin. GPS Mapping data ...

21. GPS Devices - Product Reviews, Buying Guides, and Consumer ...
Epinions.com - Browse GPS Devices category. By Price Range, Brand, Special Features, Weight, Selectable Software/Maps, Battery Life, Family Line, Store, ...

22. Comparing GPS Route Quality GPS Review
In the end, the only thing you can compare a route against is your own expectations. ... If you put a GPS into my hands, any GPS from any brand, I can quickly find for you ...

23. Compare GPS - BoatersWorld.com
Buy Compare GPS at Boaters World. Compare GPS reviews and specifications, and a large selection of products from all major manufacturers. ...

24. | Compare GPS Reviews and Ratings Including Tom Tom and ...
Compare GPS Reviews and Ratings Including Tom Tom and Garmin Reviews These days, Global positioning technology is becoming a great part of everyday life. It's essentially ...

25. GPS Compare and Save
Featuring information, specs and reviews on Garmin GPS navigation systems, handheld gps systems and other top brand GPS tracking systems.

26. Comparison of GPS Receivers Under a Forest
Comparison of GPS Receivers Under a Forest. Canopy with Selective ... This will mean that civilian users of GPS will be able to pinpoint locations up to ten ...

27. Global Positioning Systems, GPS locators, and wireless ...
Find global positioning systems GPS side by side product comparison chart for global positioning system information on pricing and features.

28. GPS Car Navigator screen Comparisons
Readers frequently ask us to "compare" this or that GPS and pick out the best one for them. This request is impossible in the general case for us to answer properly. ...

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243792 product reviews and ratings about compare gps devices in GPS Devices, MP3 Players, Flash Memory

30. Review | Best GPS Reviews 2009-2010 | Ratings ...
GPS Compare All Vehicle GPS Models. GPS Compare Garmin nuvi Models ... Top Marine GPS. Top Motorcycle GPS. Top Sports & Fitness GPS. TomTom XL ...

31. Automotive Guide at The GPS Store
The GPS Store's Guide to Automotive GPS units. There are two different types of Automotive ... However there are GPS systems that have other optional features and ...

32. Gilsson vs. Garmin external GPS antenna comparison
Field test comparing the performance of Gilsson and Garmin external GPS antennas.

33. How to Compare & Review a GPS | eHow.com
How to Compare & Review a GPS. GPS, or Global Position System, is a technology that is becoming increasingly prevalent. ...

34. Garmin Mobile PC with GPS 20x Comparison
Garmin GPS comparison table to compare Garmin GPS, Tomtom GPS, Lowrance GPS, and other GPS units.

35. Comparing GPS Receivers: A Field Study | URISA
To compare receivers, we conducted a field study of 15 established survey markers in the ... Published studies comparing various GPS receivers are limited. ...

36. 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

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