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garmin gps reviewThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
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. 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. 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 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. 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. 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. 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. 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. When it was first deployed, GPS included a feature called Selective Availability (or SA) that introduced intentional errors of up to a hundred meters into the publicly available navigation signals, making it difficult to use for guiding long range missiles to precise targets. Additional accuracy was available in the signal, but in an encrypted form that was only available to the United States military, its allies and a few others, mostly government users. 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. 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). 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. 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. 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.
1. Garmin GPS Reviews
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Garmin GPS - GPS Systems - Compare Prices, Reviews and Buy at ... Garmin GPS - 572 results like the Garmin Nuvi 255W Widescreen 4.3" Portable GPS, Garmin Nuvi 205 GPS, Garmin Nuvi 1450 GPS 5" Personal Navigation ... 32. Garmin GPS-V Mapping GPS Review Garmin's GPS-V Mapping GPS Receiver with AUTOMATIC address to address routing. Review by ... The Garmin MapSource CitySelect maps are high quality electronic maps ... 33. Garmin GPSmap 60Cx review A little over a year ago Garmin introduced the 60C and the 60CS. ... Here we review the Garmin GPSmap 60Cx an all singing all dancing handheld GPS receiver. Quick Navigation ... 34. Garmin Nuvi 265WT Review The Garmin Nuvi 265WT which we review, offers a blend of useful features and a clean interface to make this unit one of the best values in GPS. Summary ... 35. Garmin GPS-60C Mapping GPS Review Garmin's GPSmap 60C(Sx) Color Mapping GPS Receiver with AUTOMATIC Routing ... Garmin recommends the MapSource CitySelect maps for this product. This review is based on ... 36. Review: Garmin Nuvi 660 Review by the GPS Lodge | GPS Lodge ... Review: Garmin Nuvi 660 Review by the GPS Lodge. In the short time I have had the Garmin Nuvi 660, I have to say that it's the best GPS I have ever used. ... 37. Garmin GPS Accessory Reviews, Ratings, Deals and Comparisons ... We've analyzed price, features, and reviews of Garmin GPS Accessories to find the best values. Also find quick links to the most useful user reviews ... 38. 60csx garmin GPS at bizrate - Price Comparison and Consumer ... Buy 60csx garmin from top rated stores. Comparison shopping for the best price. ... garmin 60csx gps garmin 60csx review gps garmin 60csx gpsmap 60csx gps unit garmin gpsmap ... } ?>
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