About 50% of the Doppler observations made on a Navy Navigation Satellite over a 9 year period were analyzed to determine the motion of 8 sites on the North American plate and 12 sites on 7 other plates. The computed plate motions were not statistically significant compared with the standard errors of measurement of 1 to 5 cm/yr except for the Australian plate, European plate and Pacific plate. The measured motions of these plates are about twice those inferred from geologic records, but are in the proper direction.

Processing of the balance of the data on the satellite over the 9 year time interval would improve the accuracy of the determination by about 60%, improving the possibility of detecting additional statistically significant motions.

Unreasonable alitude changes at most sites are probably due to neglected higher order ionospheric refraction effects on the observations.