Welcome to GPS Hacks. This site is not about hacking a GPS but everything you want to know about GPS including General information, GPS reviews, Tutorials, GPS How-to and much more. If you want to contribute this site please feel free to Contact us. What is GPS? GPS (Global Positioning System) is a "constellation" of 24 well-spaced satellites that orbit the Earth and make it possible for people with ground receivers to pinpoint their geographic location. How GPS Works GPS system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location.