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gps receiver 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. GPS has become a vital global utility, indispensable for modern navigation on land, sea, and air around the world, as well as an important tool for map-making, and land surveying. GPS also provides an extremely precise time reference, required for telecommunications and some scientific research, including the study of earthquakes. GPS receivers come in a variety of consumer formats, and today can be found in cars, watches, phones boats and planes. Major manufacturers include Trimble, Garmin and Leica, low-end, hand-held consumer units are often available at less than $100 per unit. 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. 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. 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). 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. 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. 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. 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 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. 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. GPS Receivers Reviews
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Compare prices from across the web and read reviews ... 26. Garmin eTrex Vista GPS Receiver Reviews - alaTest USA Read 1150 reviews and find the lowest price for the Garmin eTrex Vista GPS Receiver. Overall, this GPS is rated 78/100 (Good) 27. Navman F15 3.5" Touchscreen GPS Receiver Reviews | 79 reviews ... Navman F15 3.5" Touchscreen GPS Receiver reviews. Find Car GPS reviews at Buzzillions including 79 reviews of Navman F15 3.5" Touchscreen GPS Receiver. 28. Magellan - Maestro 3100 GPS Receiver Reviews - Viewpoints Read Magellan - Maestro 3100 GPS Receiver reviews and find out why people rate it 4.0 out of 5.00 stars. People say, 'This Magellan-Maestro Rocks! 29. Handheld GPS Product Reviews - Product Tests and Ratings of ... Find the best handheld GPS receiver for your needs. In-depth handheld GPS product reviews including detailed feature specifications and ratings. 30. GPS Receiver Review - GearReview.com A comparative review of GPS Receivers, including the Lowrance GlobalMap 100, Magellan Pioneer, Magellan 2000XL, Magellan Tracker, Eagle Explorer 31. Review: Holux M-241 GPS Receiver The guys over at Avec Mobile has reviewed the Holux M-241 GPS Receiver and here is the conclusion: The Holux M-241 is a multipurpose GPS receiver. It 32. Very neat and reliable little Bluetooth GPS receiver for any ... TomTom Wireless GPS receiver Car GPS Receiver - User Rating: 5 stars. Review Summary: Good GPS receiver. Perfect for anyone that needs an easy / idiot-proof system. ... 33. Lowrance LGC-4000 GPS Receiver Review Lowrance LGC-4000 GPS Receiver review with Lowrance LGC-4000 GPS Receiver pros and cons and Lowrance LGC-4000 GPS Receiver five star rating. 34. Best Prices on GPS Receivers - Shop & Compare - PCWorld Shop and Compare Prices on GPS Receivers ... Garmin Garmin GPSMap 530 Marine GPS Receiver, Chart Plotter Only, 1 ea. Specs User Reviews Add Your Review $542.95 (2 sellers) ... 35. Bushnell Onix400 GPS XM Receiver Review | Ask Reviews Bushnell Onix400 GPS XM Receiver. Review Date: August 15, 2008 ... armor built to XPX7 waterproof standards, with a high gain SIRF GPS receiver. ... } ?>
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