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gps comparison |
car gps comparisonThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
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. 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. 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. 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 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. GPS receivers calculate their current position (latitude, longitude, elevation), and the precise time, using the process of trilateration after measuring the distance to at least four satellites by comparing the satellites' coded time signal transmissions. 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. Car Rental GPS Comparison
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GPS comparison can drive any sane person mad. ... mount, enabling you to find your car. Cool.The garmin gps also provides traffic updates ... 32. 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. 33. car gps - Compare Cheap car gps Prices & Save shopping in ... Compare Car gps price and read Car gps reviews before you buy. Find the best deal on Getprice.com.au 34. Magellan Specializing in satellite navigation and communication products. ... Refurbished GPS devices now available! Magellan Premium Car Kit ©2010 MiTAC International Corporation. All ... 35. GpsPasSion Forums - In Car GPS Reviews/comparison But what I would say is the new generation of in-car GPS would win with the voice command. ... The comparison is quite welcome here and I'll be happy to host an ... 36. Car GPS Review & Auto GPS Review Read about various car GPS units and learn how to set up and use GPS for your car. Download map or manual for your GPS for car unit. ... 37. Compare Garmin nuvi Portable Car GPS Systems at GPS Central ... Compare nuvis on comparison chart - the main features of these GPS ... All nuvis are portable car GPS units, so they can be moved from car to car or go for a ... 38. GPS Unit Reports - Fact Based User Reviews & Reports Fact based consumer reviews of vehicle and car GPS personal navigators. Comparisons of all the top selling GPS models and recommendations for the best places to buy. 39. How to Buy GPS - GPS Price and Feature Chart How to shop for a car gps, and a detailed chart comparing GPS features. How to get the best prices and features. ... Price and Feature Comparison Chart for In-car GPS ... } ?>
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