When it comes to global navigation satellite systems, GPS, GALILEO, and GLONASS are placed right at the top. While the US owns the GPS, Russia and the European Union are in charge of GLONASS and GALILEO respectively. Therefore, getting all of them in one device is like having all your fingers dipped in the pie. However, GALILEO is the most accurate of the lot, whereas GLONASS is recommended for regions located in high altitudes. GPS, however, strikes a middle ground and probably covers every base.