Which type of navigation system uses satellites to determine an aircraft's position?

The Global Positioning System (GPS) is a specific implementation of satellite-based navigation technology that determines an aircraft's position by triangulating signals from multiple satellites. GPS is widely used in aviation for precise position information, providing continuous updates on an aircraft's location anywhere on Earth.

While there are other navigation systems mentioned, they function differently. The Inertial Navigation System (INS) relies on internal sensors to track the aircraft's position based on its initial location and movements rather than external signals from satellites. The Global Navigation Satellite System (GNSS) encompasses GPS and other satellite navigation systems, but GPS specifically denotes the U.S. system. The Radio Navigation System (RNS) uses ground-based signals which are not reliant on satellite technology, making them less suitable for global positioning as compared to satellite navigation systems.

Thus, the correct choice emphasizes the role that GPS plays, as it directly utilizes satellite signals for determining an aircraft's position.