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cnet gps reviewThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
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. 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. 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. During the Gulf War, the shortage of military GPS units and the wide availability of civilian ones among personnel resulted in disabling the Selective Availability. In the 1990s the FAA started pressuring the military to turn off SA permanently. This would save the FAA millions of dollars every year in maintenance of their own, less accurate, radio navigation systems. The military resisted for most of the 1990s, but SA was eventually turned off in 2000 following an announcement by then US President Bill Clinton, allowing all users to enjoy nearly the same level of access. The most recent launch was in September 2005. The oldest GPS satellite still in operation was launched in February 1989. More accurate GPS receivers are used these days in surveying to accurately locate boundaries, structures and so on. 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. 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. 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.
1. GPS reviews, handheld GPS systems, mapping software and more ...
... and ratings, video reviews, user opinions, most popular portable navigation systems, GPS buying guides, prices, and comparisons from CNET Reviews. ... 2. 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. 3. Mio 269 Review by c|net GPS Review c|net has reviewed the Mio 269 GPS system and has given it less than stellar review... ForumsJoin our Mio Forums to discuss the Mio 269 Review by c|net in depth! ... 4. Gps, Review - CNET Australia Choosing a camera with built-in GPS has never been easier with our list of cameras that ... CNET Australia is an engaging, relevant and trusted destination for ... 5. TomTom GO 910 C|net Review GPS Review Cnet has written an initial review of the TomTom GO 910. They liked the addition of the 4 ... Also saw that GPS Magazine awarded the 910 with the Editorâ s Choice award today, ... 6. 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The new Garmin StreetPilot C550 is hitting the shelves these days and another review has hit the Net. ... 11. cnet.com | GPS reviews and tests - alaTest USA Experts reviews on GPS from cnet.com on alaTest. ... The Garmin Nuvi 295W is a solid point-to-point GPS navigator with a few neat tricks that on-foot navigators ... 12. TomTom XL 330S Reviews - alaTest USA Read 568 reviews and find the lowest price for the TomTom XL 330S. Overall, this GPS is rated 77/100 (Good) ... By vinnypanesar (cnet.com)Read the full review ... 13. Product reviews and prices, software downloads, and tech news ... CNET is the premier destination for tech product reviews, news, price comparisons, free software downloads, daily videos, and podcasts. 14. Cobra GPS100 review - GPS Quick links to useful Expert Reviews for Cobra GPS100 describing pros ... shopper.cnet.com "Basic GPS features that will get you ready to go right after you unpack ... 15. GPS Reviews : GPS Lodge - GPSLodge.com GPS reviews, GPS, GPS Receiver, Global Positioning System, Garmin, Etrex, Etrex Legend, Etrex Vista, Etrexm, Summit, GPSMap, Geko, Foretrex, Streetpilot, ... 16. Garmin nuvi 260W review | GPS Tracklog Garmin nuvi 260W review including comparisons to similar units, links to other reviews, price comparisons, owners manual, message forums and more 17. Google Translate CNET's comprehensive Garmin Nuvi 1690 coverage includes unbiased reviews, exclusive video footage and GPS buying guides. Compare Garmin Nuvi 1690 prices, user ... 18. Magellan RoadMate 500 review - GPS Quick links to useful Expert Reviews for Magellan RoadMate 500 describing pros and cons. ... reviews.cnet.com. Lightweight; accurate GPS receiver; easy to use; ... 19. Sony NV-U44 Gets Reviewed: Solid Choice For An Entry-Level ... The folks over at CNET have taken a run at Sony's NV-U44 and found that it's a solid entry-level device, and a great buy for those looking for nothing buy 20. TomTom GO 300 Reviews - Auto - GPS Reviews and Navigation ... GPS Information were satisfied by the GO 300's rerouting capacities and found ... http://reviews.cnet.com/car 21. Best Maps GPS Device of 2010 Best Maps GPS Device, Top Maps GPS Device, Best Rated Maps GPS Device, Best Overall Maps GPS Device - chosen from the Best GPS Device reviews. 22. TomTom XL 340 S gets reviewed, worth the price | GPS Obsessed In the end CNET gave the TomTom XL 340 S a 3.5 out of 5 and says the GPS device is worth the price. Read. Tagged as: gps review, gps reviews, tomtom xl 340s ... 23. Auto GPS Ratings, Best Rated Auto GPS - ConsumerSearch ConsumerSearch rates auto GPS reviews, from experts and real-life users, according to how well they test and evaluate current models' strengths and weaknesses. 24. FineDrive GPS navigation has no clue where you are! -- NaviGadget CNet had a review of them back in June and they got a 3.7 out of... Jul 11, 2006 gps navigation, gps reviews. According to CNet at least. CNet just announced the worst ... 25. Garmin Nuvi 265T Auto / Road GPS Reviews and Product Ratings ... Read unbiased Garmin Nuvi 265T Auto / Road GPS reviews by customers and experts in GPS at BizRate before you purchase the Garmin Nuvi 265T Auto / Road GPS. Ratings ... 26. CNET Reviews the Phareos GPS Phone 600e | SolSie.com GPS specialists Pharos broke into the smart phone market with the Pharos GPS Phone 600 and the Pharos GPS Phone 600e. Both smart phones are equipped 27. Mio A701 CNET " ... Mio A701 GPS Windows Mobile Review by CNet Mio A701 CNET ... CNet reviews Mio A701 GPS Windows Mobile PDA and gives a very good ... 28. Reviews Of Car GPS Units Reviews Of Car GPS Units From Consumer Reports, cNet GPS Reviews, GPS Computer Software Reviews 29. Discount GPS Navigation - Global Positioning Systems from ... Find your way home with an affordable GPS navigation system from Smarter.com. Save on global positioning devices from brands such as Garmin and Magellan. 30. Voyager Pro Car Camera with GPS Logger CNET News CNET NewsVoyager Pro Car Camera with GPS LoggerCNET News, CA - 3 hours agoVoyager hopes to help drivers deal with the situation with their Voyager Pro Car Camera with ... 31. Reviews of Best GPS devices (does not update itself) ...GPS device or kit: Pros: brings information wealth... Click here for the CNet review. Click here for this section's complete ... 32. Garmin nuvi 760 review | GPS Tracklog GPS Magazine has posted a typically thorough Garmin nuvi 760 review, giving it an Editor's Choice award. ... CNet Australia gives an 8.2 rating in their Garmin nuvi 760 review. ... 33. TomTom XL 330S Auto / Road GPS Reviews and Product Ratings at ... Read unbiased TomTom XL 330S Auto / Road GPS reviews by customers and experts in GPS at BizRate before you purchase the TomTom XL 330S Auto / Road GPS. Ratings ... 34. TomTom GO 910 Reviews - Auto - GPS Reviews and Navigation ... The TomTom GO 910 GPS Device which has a list price of $799 has got maps of the United ... http://reviews.cnet.com/car 35. How To Buy A GPS Device Should I upgrade the one I already have? In this article we provide advice and guidance on how to buy a GPS device. A GPS is an acronym for the Global... 36. CNET looking for Android blogger Write about Android for CNET!Are you a Google Android fan? Did you rush out and buy the T-Mobile G1 the moment it came out? And are you eagerly awaiting the 37. Harmon Kardon Guide + Play GPS-500 Review Harmon Kardon Guide + Play GPS-500 reviewed by ConsumerSearch, which notes pros and cons, along with reviews and ratings for the Harmon Kardon Guide + Play GPS-500 ... 38. Cnet reviews iPhone GPS Navigation Apps Personally TomTom is how I handle GPS Navigation with my iPhone 3GS, but contrary to popular belief this is not the end all be all of navigation applications on 39. Tomtom XL 330S GPS Review Gist Tomtom XL 330S GPS Review Gist ... TomTom XL 330S:CNet. The bottom line: Stylish, easy to use, and accurate, the TomTom XL 330S is a great all-around GPS but we wish ... 40. CNET reviews TomTom ONE CNET Senior Associate Editor Bonnie Cha has written an early review of the brand new TomTom ONE. ... Which connected GPS LIVE Service do you think you'd use the most? ... } ?>
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