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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.


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.

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.

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.

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.

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.

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.

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

GPS allows the military to accurately target its missile arsenal, largely composed of cruise missiles and precision-guided munitions. This was born out by the use of SOFLAM (Special Operations Forces Laser Acquisition Markers) targeting during the attacks on Tora Bora in Afghanistan. It also improves the accuracy of the US submarine launched ballistic missiles by providing precise locational information to the submarine commanders. Finally, command and control over troops is improved because commanders know precisely where their troops and the enemy are located on the battlefield.

The US military has developed the ability to locally deny GPS (and other navigation services) to hostile forces in a specific area of crisis without affecting the rest of the world or its own military systems. Such Navigation Warfare uses techniques such as local jamming to replace the blunt, world-wide degradation of civilian GPS service that SA represented.

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 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.

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. Pocket PC GPS Reviews
Check out our BIG Garmin Sale or browse our Pocket PC GPS Reviews of various makes and models. ... Copyright 2007 Globotic Media, LLC. Pocket PC GPS Reviews. ...

2. About | Pocket PC GPS Reviews
A number of GPS enthusiasts combined forces to create this blog and write reviews on the models we own are are familiar with. We hope that his provide value to

3. Pocket PC GPS Software Reviews -
That is the reason, it can be termed as pocket cum PC. Dext is one of the adorable handset in all respect. ... Geo-tagging is applicative for GPS enabled handsets, as, it allows ...

4. CoPilot Live Pocket PC 5.0 - Car GPS (Navigation)s - CNET Archive
Read product reviews and find out more about the CoPilot Live Pocket PC 5.0 Car GPS (Navigation) stored in CNET's Archive. Brought to you by CNET Reviews.

5. Mio DigiWalker P550 GPS Navigation Pocket PC Review
Mio DigiWalker P550 GPS Navigation Pocket PC Review. GPS or Global Positioning System is a fantastic tool that has been in use for years but prohibitively ...

6. pocket pc gps - GPS Accessories - Product Reviews, Compare ...
Shop for pocket pc gps. Price comparison, consumer reviews, and store ratings on Shopping.com

7. CoPilot Live Pocket PC 5 (Bluetooth GPS) - Car GPS ...
Read product reviews and find out more about the CoPilot Live Pocket PC 5 (Bluetooth GPS) Car GPS (Navigation) stored in CNET's Archive. Brought to you by CNET Reviews.

8. Pocket Navigator Review
This review covers the Pocket Navigator product from Maptech. ... Review hardware includes an iPAQ 3970 running pocket pc 2002 and several gps devices including a Garmin 12, ...

9. SemperAptus.com - Head-to-Head Pocket PC GPS System ...
While GPS systems should help you find your way, the flood of new Pocket PC GPS products ... The GPS systems in our review (from left to right) - PowerLOC ...

10. ASUS A636 Pocket PC with GPS - PDA Reviews by Mobile Tech Review
MobileTechReview.com: ASUS A636 Pocket PC with GPS Review ... The ASUS A636 and A632 are the first Windows Mobile 5.0 Pocket PCs with integrated GPS to hit the US market. ...

11. PDA GPS Review & Pocket PC GPS Review
Read PDA GPS reviews and technical specification from PDA HandHeld GPS experts as well as PDA GPS user like you. Learn how to use PDA Phone GPS and ...

12. Pocket PC GPS
PDA GPS News and Reviews including Garmin, Oncourse Navigator, Navigon and other Cell Phone GPS

13. Mitac Mio 168 / Navman PiN GPS Integrated Pocket PC Review
Last year, the Garmin iQUE 3600 Palm OS based PDA with integrated GPS created quite a stir. That unit has been highly rated by users, leaving the Pocket PC preferred ...

14. Garmin iQue M5 Pocket PC with Integrated GPS, PDA Reviews by ...
MobileTechReview.com: Garmin iQue M5 Pocket PC with Integrated GPS Review

15. PocketPC GPS and Navigation
Welcome to the site covering PocketPC (Pocket PC) products that are related GPS or to Navigation. In some cases these products may also be used with WinCE palmtops. ...

16. Pocket GPS TomTom Navigator Software Review for the Pocket PC
TomTom (also known as Palmtop.nl) were the original Pocket PC GPS mapping company. They created Route Planner, TomTom CityMaps and also the re-badged versions of ...

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Epinions has the best comparison shopping information on Epinions.com - Search Results: pocket pc gps. Compare prices from across the web and read reviews from other ...

18. HP (Hewlett-Packard) iPAQ rx5915 Automobile Navigator - HP ...
Strengths:1.GPS and a pocket PC for the price of a stand alone GPS unit. ... Strengths:GPS function works well and much better than Pocket PC functions. ...

19. Pocket PC " GPS NEWS and REVIEW
Sleek and compact, the i-mate PDA-N is a Windows Mobile 5.0 based Pocket PC with all the latest Microsoft® tools plus built in GPS navigation capability and Wi-Fi. ...

20. Review ASUS A686 A696 with GPS, comparison, specifications
ASUS has a tradition in producing Pocket PC's with built in GPS. The previous series of ASUS, MyPAL A636/639 ... ASUS A686/696 PDA with built-in GPS Review ...

21. Canadian Tire - MIO GPS with Pocket PC customer reviews ...
Canadian Tire product reviews and customer ratings for MIO GPS with Pocket PC. Read and compare experiences customers have had with No products.

22. DeLorme Street Atlas USA 2006 Handheld GPS Software for Palm ...
DeLorme Street Atlas USA 2006 Handheld GPS Software for Palm OS and Pocket PC. Aug. 22. 2005 ... the most popular piece of software among Palm and Pocket PC GPS users. ...

23. SSI-SDIO-1000 Stellus StarNet GPS for Pocket PC review
SSI-SDIO-1000 Stellus StarNet GPS for Pocket PC review ... After the software installation and inserting the GPS into the SD slot on my Pocket PC I had to find what COM ...

24. Navman Bluetooth GPS 4400 for Pocket PC review
Navman Bluetooth GPS 4400 for Pocket PC review ... Unfortunately it's not the case with Pocket PC Phone Edition devices, like the i-mate Pocket PC Phone Edition. ...

25. Medion PDA & GPS Bundle Review
... for money and came bundled with everything you could possibly need to get up and running with a working satellite navigation system. This review...

26. Medion MDPPC 250 Pocket PC PDA Review
This article reviews the Medion MDPPC 250 Pocket PC PDA with GPS Navigation. This device is at the budget end of the combined Pocket PC/Sat Nav market, ...

27. Direction Navigator PN6 Für Pocket PC GPS Software - Reviews ...
Yahoo! Shopping is the best place to comparison shop for Direction Navigator Pn6 Fr Pocket Pc Gps Software. Compare products, compare prices, read reviews and ...

28. Pocket PC GPS
Pocket PC GPS units provide the ability to combine your pocket PC needs with GPS capability. Garmin and other GPS manufactures have developed top ...

29. HP IPAQ hw6915 Review with QWERTY and GPS
Pocket PC Mobile Review: The HP iPAQ hw6915 (series 6900) ... The hw6915 is powered by windows mobile 5. It is a pocket pc mobile (with phone functionality - QuadBand) and a PDA. ...

30. Pocket gps GPS at bizrate - Price Comparison and Consumer Reviews
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31. " E-Ten Glofiish X800 GPS Pocket PC Phone ReviewToday's ...
E-TEN X800 Glofiish has the looks and the features to become a really great small PC in your pocket. ... No User Responded in " E-Ten Glofiish X800 GPS Pocket PC Phone Review " ...

32. Pocket PC GPS News and Info
Cnet.com Reviews has covered the Garmin iQue M5. Since it is listed as a highrated, top selling Pocket PC GPS, I have listed it here. Check it out. ...

33. Pharos GPS 525 Pocket PC Information Review - Pocket PC Central
Pharos Traveler GPS 525 PTL525 Windows Mobile GPS Information Center ... The Pharos Traveler GPS 525 is both a Windows Mobile 5 Pocket PC and fully-functional GPS ...

34. GPS on Windows Mobile | Smartphone & Pocket PC magazine
This article reviews the top GPS navigation programs developed for Windows Mobile devices. ... review of the final release (version 7) on the Smartphone & Pocket PC ...

35. Gps Pocket - Shop Smarter.com
Shop for Gps pocket. Search through 8 results from $10.94 like Pioneer AVIC-S1 - GPS receiver, Tomtom ONE130S GPS Navigation System, Magellan RoadMate ...

36. Anquet Maps review - Pocket-lint
Anquet Maps - Walking maps on PC and GPS-enabled Pocket PC The key to a good romp through the countryside is planning. Planning your route can be ...

37. Pocket Gps - Shop Smarter.com
Shop for Pocket gps. Search through 8 results from $10.94 like Pioneer AVIC-S1 - GPS receiver, Tomtom ONE130S GPS Navigation System, Magellan RoadMate ...

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