GPS, also known as GNNS, specifically refers to the U.S. Global Positioning System, but to all positioning systems in general. The common systems used in drones are GPS (U.S.), GLONASS (Russia), Galileo (Europe), etc. Most amateur drones are equipped with GPS for navigation and hovering; more advanced drones often support multiple positioning systems and adopt newer GPS technologies, such as RTK and PPK, and are primarily used to perform tasks such as search, patrol, inspection, surveying, mapping and more that require high hovering accuracy or route planning.