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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.


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.



1. GPSMAP
Garmin hereby grants permission to download a single copy of this manual onto a ... MAP DATA INFORMATION: One of the goals of Garmin is to provide customers with ...

2. Free Garmin GPS Maps
Download the latest 2010 worldwide Garmin GPS Maps Free! ... Garmin GPS systems are good if you are not good at navigation or sick of using a old style map. ...

3. Garmin | Follow the leader
Find Success at GarminFind job opportunities and apply online ... © 1996 2010 Garmin Ltd. or its subsidiaries | Privacy Statement | Terms of Use | Site Map ...

4. Garmin Gps Maps.com | Garmin Gps Maps Online Store
Welcome to Garmin Gps Maps online store. Get discounted and cheap Garmin Gps Maps deals and browse our product list.

5. PTY GPS Home
A Garmin compatible GPS map for the Republic of Panama. This detailed map covers the ... The map is available for immediate purchase and download from our store. ...

6. GPS Maps - Download and Manage Garmin Car GPS Maps and Software
You have many options when it comes to obtaining and updating maps for your Garmin GPS. Here's how to locate, download, and manage Garmin GPS maps.

7. Guam GPS Map Download - GPSTravelMaps.com
Guam GPS Map Download for Garmin Devices. Want to get the most out of exploring the Guam? ... The map installs into Garmin Mapsource or Roadtrip on your computer and than ...

8. Custom Maps for Garmin GPS Receivers
In order to generate my custom map, I obtained accurate geographic readings by using a ... In MapSource highlight the region you wish to download to your GPS receiver. ...

9. Mapwel - GPS Mapping Software. Often used in forestry ...
Creates custom maps for Garmin GPS units. Supports routing, ESRI shapefiles, OpenStreetMap OSM, Google Earth KML and KMZ, cGPSmapper MP and GPX files.

10. GPS Maps
Free GPS maps for Garmin GPS receivers. ... Download tutorial on how to create your own MapSource compatible maps that can be downloaded to your GPS ...

11. esambale - osmphil_garmin
OSM-PH with Contour for Garmin GPS - MapSource installer tested with Etrex Legend HCx and ... I have several gps trace I want added to the map but I don't want to edit in OSM, ...

12. Hawaii GPS Map Download - GPSTravelMaps.com
Download page for our Hawaii map. Covers Oahu, Maui, and the Big Island. Garmin GPS compatible. Travel like a local!

13. Malsingmaps.com - Downloads
The MSM NT maps are compiled using native Garmin compiler and tools. ... visit our Download Section. Banner Ads. Copyright © 2007-2010 Malsingmaps.com. ...

14. GPS maps for your Garmin GPS - San Francisco Bay Area
We hoping to develop our database of maps for your Garmin GPSMap units. ... Website" Maps will not be emailed - they are available for immediate download ...

15. GPS Maps : Hot Deals, 23%-82% off
Great deals on any GPS Maps type, street, nautical and topographical in the media of CD, DVD, flash memory & download. Prices range from $20 to $200 above. Read ...

16. MotionBased | Home
... translates GPS data into functional analysis and online mapping for ... All MotionBased customers using a Garmin fitness device should be switching over to Garmin Connect today. ...

17. Garmin GPS kort
You can download the img file here. I tested the map in my GPSmap 60C and didnt encounter any problems. ... This map has been tested and used on several Garmin GPS models. ...

18. Sending Google Map Destinations to Your Garmin GPS ...
How to send Google Maps destinations to your Garmin in-car GPS.

19. NH Snowmobile Map for Garmin GPS NH snowmobile trails map for ...
tracks mapsource waypoints garmin download tracks waypoints POI NH snowmobile trails topographic map color waterproof GPS corridor NH New Hampshire coos pittsburg ...

20. Sending custom maps to a Garmin GPS
There are 4 ways to send custom maps to a Garmin GPS. Sendmap - Requires IMG map files ... Sendmap DOS- is a program which loads the IMG maps to the GPS directly ...

21. GPSMAP 60CSx -
High-sensitivity GPS receiver gives you improved satellite reception even in ... Garmin offers a wide range of maps and charts to get you where you want to go. ...

22. Redirecting to new portal...
Provides free regularly updated, user contributed GPS maps for Garmin compatible devices. Includes forums, FAQ and articles.

23. Creating Garmin GPS maps - NzGpsWiki
Garmin have different Ids for each map they produce, as well as all the third ... Note that this will overwrite any other maps that have been uploaded to the GPS. ...

24. OSM Map On Garmin/Download - OpenStreetMap Wiki
Here are maps in Garmin image file format people have created from ... With a new Garmin device simply create a folder called "Garmin" on your SD-card ...

25. GPS Sled Maps - GPS Snowmobile Trail Maps for Garmin ...
Highly detailed and current snowmobile trail GPS maps for Garmin, Magellan, and Lowrance, covering Michigan, Wisconsin, New York, Minnesota, Ontario, and Maine.

26. Download Mapwel GPS Mapping Software
Mapwel allows to create custom GPS maps compatible with Garmin GPS units. Mapwel is often used in forestry, electrical engineering, geodesy and geology. ...

27. myGarmin
Garmin.com. You aren't signed in | Sign In | Help. Home. myDashboard ... most of your Garmin GPS. myDashboard: Map Updates. See if map updates are available and ...

28. GPS Maps Europe | Europe Maps Garmin | Garmin Europe Maps ...
These Europe maps for Garmin are absolutely free to download and use with your GPS devices. The maps are listed here by country. ...

29. GPSMAP 76Cx -
The GPSMAP 76Cx adds a high-sensitivity GPS receiver, microSD card slot, large color TFT screen and turn-by-turn routing to the mariner-friendly 76-series navigators.

30. 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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