Introduction

Humans have long been trying to find a way to know with certainty the existence of (position) on the surface of the earth itself, where she was and where he would go. Humans have developed ways to determine its position on the surface of the earth from a simple way by using the signs of nature on earth, with a view to the position of the stars using a compass and some fairly sophisticated electronic perlalatan.

But these methods have yet to include many activities on the surface of the earth, and the accuracy of the resulting highly variable. The last system was developed human being is a GPS (Global Positioning System) which utilizes the position and the signals emitted by satellites orbiting in space and captured the receiver in the earth's surface.