The irregular motion of the earth's axis of rotation, know as Chandler Wobble, was determined on the basis of Doppler observations of Navy Navigation Satellites. Measurement precisions of about 0.5 meters have been obtained for averaging times of six days. Agreement with astronomical determinations is better than one meter over the last two years. The discrepancies are no longer than differences between results for different groups of observatories as reported by the Bureau International de L'Heure and the International Polar Motion Service.