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download garmin gps mapThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
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 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 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. 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. 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. 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 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 author would have loved to have used GPS years ago in college. We had a class where we used maps and compasses. We were given precise coordinates and had to plot a course through woods and streams and swamps to find and sign in at specific latitude and longitude coordinates. Today, this sport, now called "geocaching", is a popular activity, particularly for outdoor hiking enthusiasts. 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. 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 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. 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. 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. More accurate GPS receivers are used these days in surveying to accurately locate boundaries, structures and so on.
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Garmap - Garmin GPS Navigation mapping software tool GARMAP is the complete software tool for managing your Garmin GPS unit. With Garmap, you can purchase or update your Garmin Map Sets, from street maps, topographic ... 31. Garmin GPS-60C Mapping GPS Review Garmin's GPSmap 60C(Sx) Color Mapping GPS Receiver with AUTOMATIC Routing ... Ozi Explorer is compatible for up/download waypoints, tracks, and routes to the Garmin 60C. ... 32. ExpertGPS - GPS Mapping Software for Garmin, Magellan ... ExpertGPS is GPS mapping software for Garmin, Magellan, and Lowrance GPS. View waypoints and GPS tracklogs on USGS topo maps and aerial photos. ... 33. GPSFileDepot - All U.S. Garmin Compatible Maps Welcome to the list of Garmin compatible maps for the United State of America. ... YOU MAY USE THE MAP ON YOUR COMPUTER, BUT TO SEND IT TO A GPS UNIT, YOU MUST PURCHASE ... 34. Garmin GPS-V Mapping GPS Review Garmin's GPS-V Mapping GPS Receiver with AUTOMATIC address to address routing ... The GPS provides a moving cursor on the moving map showing your position on the ... 35. YunnanExplorer - Download - Garmin GPS Topographic Maps for ... Topographic Maps for Yunnan built from Shuttle Radar Topography Mission Data for Garmin GPS units. These maps are made with cgpsmapper and you ... } ?>
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