The Full form of GPS is Global Positioning System. The Global Positioning System (GPS) is a satellite-based navigation system and it was actually maintained by the United States and originally designed to assist soldiers and military vehicles but now it is freely accessible to anyone with a GPS receiver. It allows ground users to determine their exact location, velocity and time 24 hours a day, in all weather conditions, all over the world. It is widely used to track vehicles and follow the best route from one place to another place by Airlines, shipping firms, courier companies, drivers etc. Currently, a growing number of people rely on GPS technology to securely guide them to their destination apart from other purposes facilitated by the addition of GPS to mobile devices. Today GPS technology is changing the way we live and communicate and its successful applications influence all our lives in a very distinct manner. The evolution of GPS is a gradual process transforming many diverse areas of human activity. It can be divided into three different segments which are Space segment, Control segment and User segment. The Space Segment refers to satellites and there are around 24 satellites distributed in six orbital planes, whereas, Control Segment refers to stations on Earth developed to maintain and monitor the satellites and User Segment refers to users that process the navigation signals received from the GPS satellites to calculate position and time.