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mac gps softwareThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
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. 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. The GPS system uses a satellite constellation of 24 satellites in intermediate circular orbits. The orbits are designed so at least four satellites are always within line of sight from almost any place on earth. The constellation also includes three spare satellites in orbit. More accurate GPS receivers are used these days in surveying to accurately locate boundaries, structures and so on. 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 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 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. 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. 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. 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. 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.
1. MacGPS Pro Mac OS X Navigation Software - Home
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The software-descriptions on this page were taken from the vendors homepages. ... Plug your GPS into your Mac and watch as your boat moves along in real-time, ... 30. Download GPS Tools Software for Mac - Utilities Download GPS Tools Software for Mac - Utilities ... Le Petit Poucet GPS Software 0.3.0b2. 05/25/2010. 156. Le Petit Poucet - display and edit GPS routes and tracks in a 3D scene. ... 31. Software's the Missing Link to Your GPS Unit | Auto ... What GPS product reviews normally ignore, though, is the GPS Software which is required in order for the device to interface with the Windows or Mac systems properly. ... 32. SoftLow.com - Mac OS X Software Downloads, page 50 Softlow.com - Mac OS X Software Downloads: games, demos, audio, gps, positioning, global, topodraw, oswan 33. Garmin: Forerunner 305 Software Update Collection Additional Software. Forerunner 205/305 GPS Chipset , Ver. 3.00, as of Nov 12, 2007, ... 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Since Mac users range from beginners to gurus, please be tolerant of "dumb" ... 39. Science Library Pad: GPS loggers and Macs: why can't we all ... The state of the union between inexpensive GPS loggers and the Mac is not so good improving. As far as I know: The AMOD AGL3080 mounts as a USB drive on Mac, ... } ?>
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