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The GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.

As a positioning system, GPS allows users to map waypoints, tracking their position on a map to within a few meters of their exact location. Civilian use GPS systems are made by companies such as Magellan, Garmin and Trimble.


Hand-held GPS units are often used by hikers and mountain climbers to plot their courses and to accurately reflect exactly where they are. The author once used GPS to organize a helicopter evacuation of an injured motorcycle rider in a remote region of the La Sal mountains in Utah. A reading was taken, coordinates given, and the pilot was able to find us with ease.

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.

In 1985, ten experimental Block-I satellites were up. A complete "constellation" of 24 satellites was in orbit by January 17, 1994.

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.

The most recent launch was in September 2005. The oldest GPS satellite still in operation was launched in February 1989.

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.

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.

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.

During the Gulf War, the shortage of military GPS units and the wide availability of civilian ones among personnel resulted in disabling the Selective Availability. In the 1990s the FAA started pressuring the military to turn off SA permanently. This would save the FAA millions of dollars every year in maintenance of their own, less accurate, radio navigation systems. The military resisted for most of the 1990s, but SA was eventually turned off in 2000 following an announcement by then US President Bill Clinton, allowing all users to enjoy nearly the same level of access.

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.

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.



1. Review: Navman 4470 GPS for Palm OS 5 at bioneural.net
Tags: bluetooth, Gadgets, gps, navman, New Zealand, palm, pda, software, tomtom. ... Note: Navman no longer sell GPS solutions for Palm; there will be no new maps or software ...

2. Navman PiN 570 PDA with GPS Review: Powered by ConsumerGuide ...
The Navman PiN 570 is a fine example of a Pocket PC combined with a GPS system. Consumer Guide has the full review.

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Navman Sleeve FAQ for OziExplorerCE GPS tracking software.

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The NavMan GPS 3450 for iPaq, a NavMan PDA GPS, with description, reviews, videos, comparison and specifications.

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PDA GPS. NavMan. Search our store! Sort products by: [ Name ] [ SKU ... installation of GPS vehicle navigation systems and GPS tracking devices AVL ...

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NavMan has a GPS system that gives you turn-by-turn instructions by voice & has 3D views of maps scaled to your traveling speed, automatic rerouting & more. ...

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9. GPS Navigation Sales: Navman GPS (Page 1)
Navman GPS - Discount sales of top name GPS Navigation Devices. Portable, hand-held and in vehicle GPS

10. NAVMAN GPS
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11. PDA/ Handheld/ GPS
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Le Navman N6Oi est équipé de la navigation par photo ! Découvrez la fonction NAVPIX en vidéo sur gpsautomoto.com. Watch Video about Pda,GPS,Boobs by ...

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Found out while on my trip to Cairns that the Navman 720 has a faulty time zone file and that you will ne... in GPS forum.

17. GPS Systems Direct - Navman
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18. PDA FAQ
PDA FAQ for OziExplorerCE GPS tracking software. ... When you run the Navman SmartST software (Version 3) it programs the GPS to output only the NMEA sentences it ...

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25. GPS Navigation Sales: PDA Mobile PC GPS (Page 1)
PDA Mobile PC GPS - Discount sales of top name GPS Navigation Devices. Portable, hand-held and in vehicle GPS

26. Navman's PIN GPS PDA : Tech Digest
Coming in early summer is the first PDA with integrated GPS facilities from Navman. The £500 Navman PIN uses mîcrosoft's Windows Mobile Pocket ...

27. Navman PiN 570 GPS Pocket PC
Navman PiN 570 GPS Pocket PC: If you're on the go a lot, you need a device that can ... Combines a Pocket PC PDA device with a powerful GPS navigation system ...

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30. Tech Digest: CeBIT: Navman's GPS PDA
Navman, one of a small but interesting contingent of exhibitors from New Zealand at CeBit, has new GPS product in the guise of the PIN 57, a Windows based PDA. ...

31. PDA Vs NAVMAN Compatibility Table
PDA Vs NAVMAN. Compatibility Table. Click HERE for Software compatibility. Legend. Not yet ... GPS 4410/4420 Compatible. GPS 4460/4470 Compatible. H6300. HW6515. HX2110. HX2410. HX2750 ...

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37. Best GPS Navigation: Navman GPS (Page 1)
Navman GPS - Discount sales of top name GPS Navigation Devices. Portable, hand-held and in vehicle GPS

38. Navman PIN GPS
The Navman PIN GPS (personal interactive navigation) system is a ... The Navman PIN is a windows mobile based device and it looks much like the current crop of PDA's, that's ...

39. GpsPasSion Forums - PDA GPS - Navman announced the PiN 570
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40. Navman's PIN 57 GPS PDA -- Engadget
New Zealand-based Navman is showing off their new PIN 57 GPS PDA at CeBIT this week. The device runs onWindows Mobile 2003 and uses Navman

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