The Global Positioning System is often called GPS for short. It is a network of satellites, ground stations, and receivers. These components work together to pinpoint ones location on the earth. The GPS is the only system that offers the accuracy and convenience of this navigation. In the past few years the technology of the GPS system has become widely available.
Different people use the system for different things.
The GPS system is still a fairly new technology and people are coming up with new uses for the GPS every day. Humans have always used waypoints or markings to prevent getting lost. In early times humans learned to use the stars as a reliable way to chart their course. During WWII a ground based radio navigation system was developed. It was clear a better system was needed, the GPS started by trying to find navigation system that was accurate and covered a large area.