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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.


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.

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.

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.

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.

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.

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.

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.

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 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.

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).

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.

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.

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.



1. FoxTrax GPS
The FoxTrax's GPS Fleet Tracking System provides extremely high quality mapping, detailed custom reporting, no contract requirement, and the best ...

2. GPS Vehicle Tracking Services | Surf Technologies
Experience - Years of Vehicle Tracking Service. All units Certified by ... Surf Technologies offers tracking and reporting solutions that are easy to use, ...

3. GPS Vehicle Tracker : GPS Tracking : Go Track, Inc.
GoTrack offers the industry's easiest to install GPS tracking device. Our services include GPS Vehicle Tracker and GPS Tracking.

4. Bekijk gratis waar jouw GPS tracker zich bevindt! - GPStracker.nl
Bekijk gratis waar jouw GPS tracker zich bevindt via GPSTracker.nl!

5. Aercept Mobile Asset Tracking Service
AerceptTM Mobile Asset Tracking Service. CalAmp is a leading developer, ... wireless, GPS, and Internet technologies to provide businesses with industry leading ...

6. AccuTracking
Software that turns Motorola iDEN phones carried by Nextel (U.S.) or Telus (Canada) into a GPS tracking device.

7. Global Positioning System
Public information about the Global Positioning System (GPS) and other space-based positioning, navigation, and timing (PNT) systems

8. GPS Tracking Service
A GPS tracking service can tell you where your teen is in real-time. A data logger can give you exact GPS coordindates of where your teen has ...

9. Map your tracks and photos, share your position from your ...
GPSed is a free location-based service for trip tracking from mobile and storing GPS tracks in an online archive. Take photos while traveling and link them to a map ...

10. GPS tracking and Fleet Management: GPS and Tracking Solutions
Innovative GPS vehicle tracking systems using cellular phones. Fleet gps tracking and management system. Covert real-time under vehicle tracking system. ...

11. GPS tracking & navigation with Garmin | Navtrak
Track your vehicles with Navtrak GPS tracking and provide drivers with accurate turn-by-turn navigation and messaging.

12. SageFleet Business Class GPS Tracking Services
SageFleet Business Class helps field service organizations reduce operational cost and improve employee efficiency through the use of state of the art GPS Fleet ...

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Choose quality Gps Tracking Service Manufacturers, Suppliers, Exporters at alibaba.com. ... Home > Showroom > Search : gps tracking service 776 Products ...

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15. Services : GPS Fleet & Vehicle Tracking : Vehiclepath
The Vehiclepath Fleet Tracking Service Plan. Use GPS technology to view all your vehicles at once and check where they have been, receive detailed stop/move mileage ...

16. FleetMatics Tracking Systems
Track small, medium, and large fleets with real-time GPS tracking. FleetMatics features online monitoring, historical route replays, and key management reports.

17. TrackerTEL - GPS Vehicle Tracking Equipment, Mobile Asset ...
TrackerTEL GPS is a Fleet Asset Tracking Solution that allows you to control cost, increase productivity, increase speed of service and employee safety. ...

18. GPS Tracking Service : AlliedIntelGPS
GPS Tracking Services by Allied Intelligence Inc. : AlliedIntelGPS.com ... This new handheld GPS tracker lasts up to 3 years. Quad mode means this device and our software work ...

19. Real time GPS Tracking solutions - GpsGate.com
GPS tracking platform for real time vehicle tracking. Available both as software and a hosted service. Starter Pack with a 30 day free trial! Partner Information ...

20. GPS Tracking Devices - GPS Intelligence
GPS and Hybird-Assisted GPS asset tracking, vehicle/fleet tracking, and law enforcement tracking services for clients nation wide. Offering only the latest, most ...

21. GPS Tracking Services
GPS tracking services are now more commonly used than ever before. ... All GPS based tracking systems use the GPS (Global Positioning System) network that is provided and ...

22. SPOT SATELLITE MESSENGER :: HOME PAGE
SPOT Satellite GPS Messenger. SPOT Personal Tracker. DeLorme PN-60w & Communicator ... ADDITIONAL SERVICES. Additional Services Overview. GEOS Member Rescue ...

23. Covert GPS Vehicle Tracking Systems Atlanta Georgia and Southeast
Your fleet is your investment, your money. Our goal is to maximize your investment return by providing you with Industry Proven Vehicle Tracking Technology.

24. GPS Tracking, Vehicle Tracking System & Satellite GPS Fleet ...
Offers satellite GPS tracking system units and services for vehicle tracking and fleet management. Your GPS solutions provider. Call (866)320-5810.

25. GPS AnyPlace Fleet Tracking Management & Personal Tracker ...
Tracking includes GPS for trucks trailers vehicles marine heavy equipment personnel, ... Tracking includes GPS for trucks trailers vehicles marine heavy equipment personnel, ...

26. GPS Web Tracking, Inc. supplies a wide variety of GPS related ...
Providing secure GPS solutions to meet the specific needs of City, State & Local Governments for Police, Fire, Rescue & Waste Management tracking services. ...

27. GPS Tracking and Fleet Management Systems - View wide variety ...
Real-time, Passive and Hybrid GPS tracking systems available from one source. GPS Fleet Solutions consults with companies to match the right fleet ...

28. Youth Driving Safe: Teen GPS Tracking - GPS Geo-fencing
Youth Driving Safe provides GPS vehicle tracking equipment and GPS location service to the parents of first-time teen drivers

29. GPS Tracker | GPS Tracking Device | Global Positioning System ...
Wouldn't it be nice to know that your loved ones are OK no matter where they are? With the Birds Eye Global Tracker, we are able to provide GPS tracking for families ...

30. GPS Tracking Services
A GPS tracking service is a GPS technology based continuous tracking service of moving vehicles, vessels and air cargoes. It works for keep eyeing ...

31. GPS VEHICLE LOGGER TRACKING JAKARTA INDONESIA GIS TELEMATICS ...
Our GPS Tracking Services are currently used by many companies and individuals in ... INDOGPS Vehicle Tracking Service is an advanced real-time monitoring tool for fleet ...

32. GPS Tracking : Acadian Monitoring Services
GPS Fleet and Asset Tracking. Mobile Monitoring Services provides vehicle and asset location-based tracking services using the latest in Global ...

33. GPS Tracking Software, GPS Car Tracking from China Bofan
With our GPS tracking software(LiveGTS) and GPS car trackers, It is easy for you to build your GPS tracking service in your country.

34. GPS Tracking Products & Services - EasyTracGPS, Inc.
EasyTracGPS offers GPS tracking solutions to fill every need. Fleet tracking, covert GPS tracking, GPS child tracking, private investigator GPS tracking, ...

35. MarineGuard Reporting/Tracking Services
MarineGuard offers a number of different reporting/tracking services so you can be quickly notified should your boat alarm trigger or your boat be moved without your ...

36. GPS Tracker UAE
GPS Tracker UAE Wireless Fleet Management System an advance technology for managing ... Our service allows customers to track the movement of their vehicles, ...

37. Car GPS Tracking, GPS Tracking Devices for Cars, GPS Tracking ...
We offer a wide selection of GPS tracking devices for your car, children, and animals. Keep track of your car and kid with Global Tracking Group GPS devices.

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