As part of the Acoustic Thermometry of Ocean Climate (ATOC) project, a moored autonomous system with a single hydrophone at the SOFAR axis depth was deployed in early 1996 off the New Zealand coast. The source was on the Pioneer Seamount off the California coast some 10 Mm across the Pacific Ocean from the receiver. Acoustic data have been recovered from the system for a period of 2 or 3 weeks in early April 1996. The received signals are affected by Doppler compression due to receiver motion and this must be accounted for in the data analysis. Problems in estimating and allowing for the effects of Doppler compression in these data will be discussed and results from the above data will be presented.