Which system determines precise position on Earth through satellites, tracking stations, and receivers?

• A. Geographic Information System (GIS)
• B. Global Positioning System (GPS)
• C. Global Navigation Satellite System (GNSS)
• D. Remote Sensing System

Answer: (B)

Precise positioning on Earth using satellites, tracking stations, and receivers comes from a system designed to determine location by measuring signals from space. A receiver on the ground collects time-stamped signals from multiple satellites, and by comparing travel times, it calculates its distance to each satellite. With at least four satellites, it can solve for latitude, longitude, and altitude, along with any small clock errors, delivering accurate position data. Ground tracking stations maintain the satellites’ orbits and clock accuracy, providing corrections that keep the whole system precise. This integrated setup is the Global Positioning System, a specific global navigation satellite system built for exact positioning anywhere on the planet. The broader term GNSS refers to all such systems (including others like GLONASS, Galileo, and BeiDou), but the description matches GPS as the particular system designed for pinpoint Earth positioning. GIS is about mapping and analysis of spatial data, not real-time positioning, and Remote Sensing covers sensing Earth’s surface from a distance for imagery and data, not navigation.