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handheld gps comparisonThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
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). 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 most recent launch was in September 2005. The oldest GPS satellite still in operation was launched in February 1989. 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 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. 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. The first experimental Block-I GPS satellite was launched in February 1978. The GPS satellites were initially manufactured by Rockwell International and now manufactured by Lockheed Martin. Most ships and airplanes are equipped with GPS systems so that they can accurately plot on a map where they are. In planes, this is especially useful during bad weather, and in ships in knowing where shallow water and other sunken obstacles may lie. 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. 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. In 1985, ten experimental Block-I satellites were up. A complete "constellation" of 24 satellites was in orbit by January 17, 1994. 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.
1. Handheld GPS Comparison : GPS Handheld Navigation : GPS ...
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In-depth handheld GPS product reviews including detailed feature specifications and ratings. 35. GPS devices comparison - GPS Price Comparison. page 1 Compare GPS devices before you buy, Compare prices of top brand GPS from many reputable stores. Page 1 36. Travel By GPS Comparison Which is the best GPS receiver for GPS Tours, hiking, boating, and car navigation. Here are the GPS units I reocommend. ... Compare Garmin Handheld GPS devices ... 37. Side by Side GPS Comparisons Magellan today unveiled the next generation of its award-winning, rugged eXplorist handheld GPS devices for the outdoor recreation market. What is GPS Compare all about? ... 38. # Handheld Gps Navigator Handheld Gps Navigator Store. Shop online for Electronics Technology. Compare Prices and Read Consumer Reviews. 39. Handheld GPS - Compare Prices, Reviews and Buy at NexTag ... ... Handheld Gps With Waas, Garmin Oregon 450 Handheld Gps With Worldwide Basemap, Garmin Dakota 20 Handheld GPS System, Snooper Truckmate S7000 Europe ... } ?>
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