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GPS is becoming more a part of our daily lives all the time. If you buy a new car, chances are good that the option is available for a GPS navigation system with him. This is a matter of time before the GPS becomes a standard feature on all new cars leaving the assembly line. GPS cell phone is increasingly rapidly. At the present time. If you make an emergency call the police or fire department of a unit – corded phone police know exactly where you are calling.

We tend to take for granted the GPS in the same way as we do on the Internet. We assume that it’s almost free for everyone everywhere, but it’s really not true. GPS was developed in 1970 and is owned, operated and controlled by the army of the United States. If the U.S. military wants to cut or control your access to the GPS system, they can. Indeed, prior to May 2000, all civilian GPS units had limited access to the GPS system called selective availability.

The GPS system consists of 24 military satellites orbiting Earth at an altitude of 11,000 miles, so at any time and location of the GPS receiver receives signals from at least six of these satellites at a time. Six orbital paths are set up four satellites evenly each of the 6 orbits.