What is the function of a Master Control Station in the GPS system?

The Master Control Station plays a crucial role in the functioning of the Global Positioning System (GPS) by processing satellite information and updating the navigation messages that are sent to GPS satellites. This function is integral to ensuring that the GPS satellites are providing accurate location and timing information to users around the globe.

The station monitors the satellite signals, calibrates satellite clocks, and performs necessary adjustments to maintain the system's accuracy. By updating navigation messages, the Master Control Station ensures that all devices using GPS can receive the latest information regarding satellite positions and other essential data necessary for precise calculations.

Other potential functions, such as managing user devices, transmitting location data, or collecting raw satellite data, are handled by different components of the GPS framework or by end-user devices and are not specifically the responsibilities of the Master Control Station. This laser focus on processing and updating makes option C the correct choice.