BENCHMARKS - GPS (NOAA) --
Geodetic Control Points with GPS Locations, 2005 (Source scale is unknown)
Shows geodetic control stations maintained by the National Oceanic and Atmospheric Administration, National Geodetic Survey, for which locations have been confirmed using global positioning system (GPS) technology. Each geodetic control station has either a precise latitude and longitude used for horizontal control or a precise orthometric height used for vertical control (units are meters above the geoid), or both.
FGDC metadata: BENCHMARKS_NOAA_IN