The document discusses Global Navigation Satellite Systems (GNSS) and how they work by using time signals from satellites to pinpoint locations worldwide. It mentions several satellite systems used for navigation including GPS, GLONASS, Galileo and Compass. Each country has an agency responsible for establishing national geodetic control networks for precise positioning data. The document also describes the services of Edi Supriyanto & Partners, including establishing a geodetic network in Timor-Leste and documenting site locations.