It looks like you mistyped the URL in your address bar or have followed an old bookmark.
Correction data is used in surveying and navigation to enhance the accuracy of GNSS. Learn here about what types of errors it fixes, how you can use correction data in your projects, and the difference between DGNSS, RTK, SBAS, and PPP
Celebrate GIS Day by taking advantage of our exclusive offer of up to 35% discount on our best-selling GPS/GNSS products!