People see how the agents track the suspects in American TV shows 24 hours, actually they are using cell phone Gps tracking technology.

Gps, short for global positioning system, is a global radio navigation system developed by the US department of defense, it consists of 24 satellites and by connecting to at least three of them, any device that has a Gps receiver can determine its current location，and other factors like speed, time and distance.

In order to track your or others’ location, you need certain sever and clients. The sever which has a static IP receives and stores the clients locations so that people can keep track of them, this is very useful to track children, the old and fleets. The Gps compatible clients (like PDA and cell phones) however, in order to be tracked, must have a built-in communication chip and certain software which send its current Gps coordinates to the sever via Gsm/Gprs.

Gps cell phone tracking technology advances quickly, the accuracy increased a lot in the past decade so it can be used to track anyone with a Gps cell phone with their permit and certain programs installed.

Some companies now offer a service, that you can use Google earth to watch someone’s movements. The Gps device send its coordinates at pre-set intervals to the server, and you can enter the coordinates at Google earth to see its locations, however, there are some programs that will update the coordinates on Google earth automatically.

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