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gps tracking

gps tracking

Online Information on gps tracking

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.


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.

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.

GPS is short for (the) Global Positioning System, a satellite navigation system developed by the US Department of Defense. A fleet of more than two dozen GPS satellites broadcasts precise timing signals to GPS receivers, allowing them to accurately determine location anywhere on Earth. In practice, this means that using a GPS device, you can find out where you are in terms of longitude, latitude and altitude.

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.

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.

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.

In late 2005, the US government introduced the first in a series of new generation GPS staellites offering new capabilities. Chief among these is a second civilian GPS signal called L2C for greater accuracy and reliability.

More accurate GPS receivers are used these days in surveying to accurately locate boundaries, structures and so on.

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 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.

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.

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.

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.

The US military has developed the ability to locally deny GPS (and other navigation services) to hostile forces in a specific area of crisis without affecting the rest of the world or its own military systems. Such Navigation Warfare uses techniques such as local jamming to replace the blunt, world-wide degradation of civilian GPS service that SA represented.

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.



1. RMT GPS Tracking Systems
GPS tracking devices by RMTracking. Large variety of GPS tracking systems for consumers and businesses. Fast and discreet shipping. Call (888) 242-0500

2. LandAirSea GPS Tracking Systems
LandAirSea Systems provides effective, affordable GPS tracking systems, devices, and software.

3. GPS Tracking and Vehicle Tracking: Home
GpsGate tracking solutions are used to track vehicles, valuable assets and persons. ... Become a GpsGate Tracking partner and set up your own GPS tracking business. ...

4. LiveViewGPS
Provides real-time GPS tracking and monitoring solutions for vehicles, assets, and people. All LiveView devices work with web based platforms with ...

5. GPS Tracking Devices | Spy GPS Tracker Device | Vehicle & Car
With unlimited tracking, this super sensitive GPS tracker will continually track even if low reception areas where other GPS trackers fail. ...

6. Trackstick
GPS tracking and photo geotagging with Trackstick. Uses the latest in GPS mapping technologies from Google Earth to display an exact location on satellite ...

7. GPS tracking unit - Wikipedia, the free encyclopedia
A GPS tracking unit is a device that uses the Global Positioning System to determine the precise location of a vehicle, person, or other asset ...

8. Tracking Key by RMTracking
This Tracking Key tracks second-by-second. Details on our tracking key product such as it's power, GPS and data specifications. See what this Tracking Key can do for you.

9. Vehicle Tracking | GPS Tracking | Surveillance
GPS vehicle tracking for family, business, law enforcement, NO MONTHLY FEES starting at $199. Real-time vehicle tracking with 10-second updates. 847-462-8100.

10. GPS Tracking Device Ultra-Sale | Spark Nano Smallest GPS ...
Lightning Gps Tracking Presents the Spark Nano GPS Tracker the world's smallest gps tracking device. Get it on SALE NOW. The perfect solution for any fleet size.

11. GPS Tracking Information helps to inform you of all types of ...
Discover the world of gps tracking with all types of solutions, systems and software to help you with choosing the right device for you whether to ...

12. 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.

13. GPS vehicle tracking
gps vehicle tracking ... Welcome to MightyGPS Tracking Solutions. Find various data loggers and real time tracking solutions for end users and commercial resellers. ...

14. GPS Tracking Locator | Personal GPS Tracker | Child GPS ...
GPS Personal Safety Devices. We offer several personal hand-held GPS security device which features real-time location tracking, emergency alarm ...

15. GPS on SALE : GPS Tracking : Vehicle Tracking
Our goal is to assist you to purchase the right product for your tracking needs. ... Many of our GPS Vehicle Tracking units offer real-time delivery of information. ...

16. GPS TRACKING EQUIPMENT
CAR TRACKING PRODUCTS! GPS Tracking Systems and automatic data loggers! Conduct a surveillance without even being there!

17. InstaMapper - Free Real-Time GPS Tracking
... service that allows you to track a GPS-enabled cell phone online in real time. ... Please note that we disallow all forms of covert tracking. ...

18. Global Tracking Communications
Specializes in GPS vehicle tracking systems. ... The APU is a very small, self-contained GPS tracking and communications device that can be easily hidden in ...

19. GPS Tracking | How it works
How GPS Tracking Works - A GPS Tracking device can enable anyone to track the location of a person, a vehicle, or an asset anywhere on the earth. ...

20. NavIQ Web Portal
Invalid Login. Username: Password: Forgot your password? Click here for password reset. Please visit the RMT website for. inovative GPS tracking solutions. ...

21. GPS Insight
The GPS Insight real-time GPS tracking and GPS fleet tracking system provides a powerful and affordable way to track your entire fleet with ease.

22. GPS Tracking | Vehicle Tracking | Teen Tracking
The GPS Tracking Key is a vehicle tracking system that records the location of a vehicle, second by second, within 2.5 meters of accuracy. ...

23. GPS Tracking Devices, Fleet GPS Vehicle Tracking, Personal ...
GPSTrackingDevices4u offers the best selection of GPS Tracking Devices, Fleet GPS Vehicle Tracking, and Personal Location Devices.

24. GPS Tracking Key
The GPS Tracking Key by L.A.S. is the smallest and most popular GPS Tracking Device in the world. Over 40,000 units in use around the world and assembled in the USA. ...

25. GPS TRACKING, GPS VEHICLE TRACKING, Fleet Management, GPS ...
GPSintegrated.com is a Web & Mobile based GPS Location Tracking System. ... This service require you to purchase a GPS Tracking device, a Mobile SIM card and Web ...

26. GPS Tracking Devices For Fleet And Small Business Vehicle ...
GPS Vehicle Monitoring Devices for Vehicle Tracking, Fleet Tracking or Car Tracking. Real Time GPS and Hidden Gps Devices To Track Vehicles, Track ...

27. Open GPS Tracker
Welcome to the Open GPS Tracker site. The Open GPS Tracker is a small device which plugs into a $20 prepaid mobile phone to make a GPS tracker. ...

28. GPS tracking devices manufacturer - Vehicle tracking ...
Laipac manufacture GPS tracking systems, S911 bracelet locator, S-911 personal locator, Starfinder AVL for personal tracking, vehicle tracking, trailer tracking ...

29. GPS tracking is nowadays used for many different applications
GPS car tracking is one of the oldest tracking applications, as the dimensions and weight of the devices are less critical for installation in a car. ...

30. GPS INDONESIA TRACKING MAP JAKARTA NAVIGATION VEHICLE TRACKER ...
INDOGPS, Software Development, Vehicle Tracking System, GPS Tracking, Geographic Information System, Vehicle Navigation

31. GPS Tracking for Vehicles, Fleets, Trucks, and Assets
A BBB Company dedicated to GPS tracking of vehicles. Track What Matters tracks fleets of trucks, cars, trailers, containers, and other assets.

32. 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.

33. GPS Tracking Devices at GPS Central - GPS Central U.S.A.
Keep track of what's important with a personal locator beacon (plb) or GPS tracking device from GPS Central USA.

34. GPSonsale
Features the latest GPS units and accessories. ... GPS units are widely used as vehicle tracking devices. Garmin and Magellan both offer top quality GPS systems ...

35. Amazon.com: gps tracker
A community about gps tracker. Tag and discover new products. Share your images and discuss your questions with gps tracker experts.

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