A Geodetic Reference System is a framework used to measure and represent the Earth's shape, orientation, and gravity field. It provides a consistent way to define locations on the Earth's surface, allowing for accurate mapping and navigation. These systems are essential for various applications, including surveying, cartography, and satellite positioning. One common example of a geodetic reference system is the Global Positioning System (GPS), which relies on a network of satellites to provide precise location data. Other systems, like the World Geodetic System (WGS84), serve as standards for global positioning and are widely used in geographic information systems (GIS).