There are more than 22000 satellites around our World. These satellites are arranged in three layers around the World. The first layer contains satellites used for internet, television broadcast. On the 2nd layer, there are telephone communication and similar satellites. Finally, there are GPS satellites in  the 3rd layer. When we reguest these satellites ensure that we can reach the position and many information.GPS technology has been used in our country since 2000. Among the usage purposes, the most important is to reach the location information of the vehicles.