GPS (Global Positioning System) is a satellite-based navigation system that provides location and time information in all weather conditions. It is made up of a network of 24 satellites placed into the orbit. It is maintained by the United States Government and can be freely accessed by anyone with a GPS receiver. It can work in any weather condition and anywhere in the world for 24 hours a day. It was originally developed for military applications but in the 1980s, the government made the system for civilian use.