Home / Nearest Base stationA GNSS receiver sitting still on a known spot. It figures out how wrong the satellite signals are right now and shares that as corrections.More
Nearest base station
Find the NOAANational Oceanic and Atmospheric Administration. The US agency that includes NGS and runs the CORS network.More base stations closest to you, see how far away they are, and what that distance means for accuracy.
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Why distance matters. The farther you are from the base, the more error creeps in. A typical survey receiver is rated about 8 mm + 1 ppmParts per million. In GPS specs, 1 ppm means 1 mm of extra error for every kilometer you are from the base.More side to side. 1 ppm means 1 mm of extra error for every kilometer from the base. So 10 km away adds about 1 cm, and 30 km adds about 3 cm. Getting a fix also gets slower and less reliable as distance grows. Network RTKReal-time kinematic. A way to make GPS accurate to about an inch by getting live corrections from a nearby base station.More (VRSVirtual reference station. The network blends nearby stations to create a pretend base right next to you, which keeps the baseline short.More) models errors between stations, so network spacing matters more than any single station. NOAA CORSContinuously Operating Reference Station. A permanent GPS receiver that records satellite data all day, every day.More sites are data stations: many feed state real-time networks, but not every one streams public RTK.
Station list: operational US NOAA CORS (ITRFInternational Terrestrial Reference Frame. A worldwide datum. In the US it's about a meter different from NAD 83.More positions, NGSNational Geodetic Survey. The part of NOAA that runs the official US coordinate system, CORS and OPUS.More file dated October 14, 2026), source. Private network station coordinates are not included because operators don't publish them in a downloadable form.