A Geo-Ranging Navigation System (GRNS) is a radio-navigation method that uses a geostationary satellite as a fixed reference point in space. By timing a radio signal’s round trip to the satellite, it determines range—the distance between the receiver and that orbital beacon. Combined with azimuth (compass bearing), elevation (angle above the horizon), and the satellite’s known longitude, the GRNS can precisely locate a vessel or surface station on a planetary body. The azimuth shows direction, the elevation shows height above the horizon, and the range defines distance to the satellite.