Gps Satellites send signals to Gps Receiver (Unit), Receiver communicates with Wireless Networks, Networks communicate with our Servers, and our servers communicate with you through any internet access.

Here is more information on GPS:

GPS (Global Positioning System) consists of 24 Earth-orbiting satellites at a height of app. 20,000 km (12,500 mi) and circle the earth in 12 hours. Each of these satellites weight about 775 Kg (app. 1700 lb) and costs are estimated at $12 billion US dollars.

These satellites allow any person with a GPS receiver to determine their  position anywhere on the world.  Using satellite technology, our system records all historical activity of the unit. You will be able to locate position, direction of travel, speed, as well communicate through unit.  You can access the  system from any internet connection 24/7, providing you with the capability to view where those you care for are, and call them if necessary.

Up to early 2000, the GPS satellites included an error in their signal for non-military users, limiting the accuracy. May 2000 this error has been removed.

For a GPS receiver to find your location, it has to determine two things:

• Exact location of at least 3 GPS-satellites.
• The distance between you and each of these satellites.

GPS satellites send out radio signals that your GPS receiver can receive.

A GPS receiver measures the time it takes for the signal to travel from the satellite to your GPS-receiver. Since radio signals travels at the speed of light, we can figure out how far the signal has traveled by figuring out how long it took to be received by you GPS-receiver.

A GPS receiver contains a normal quartz clock.

This allows it to adjust its clock matching the atomic clocks of the satellites.
Distance measurements are very accurate now. For this reason, a GPS receiver actually keeps extremely accurate time!  Thereby providing very accurate location information.