https://insidegnss.com/federal-agencies-move-to-close-most-ndgps-sites/
Federal Agencies Move to Close Most NDGPS Sites - Inside GNSS - Global Navigation Satellite Systems...
Apr 4, 2018 - A Federal Register notice published yesterday (August 18, 2015) seeking comment on plans to shut down a large portion of the Nationwide Differential GPS (NDGPS)