Independent evaluation of the new GPS Operational Control System OCS is an Air Force objective. For this purpose, continuous counted, carrier tracked phase data of the six Navstar satellites from the Air Force Geophysics Laboratorys AFGL MIT receivers was requested. These data are combined with conventional GPS pseudo-range data to estimate the Navstar orbits and the GPS Intermediate Control System ICS station locations. It was discovered that the ICS station net was inconsistent with the AFGLMIT receiver locations. The difference between the two reference systems is about 10 meters in longitude.