auv-ee,
My hope for retrieving the boxes still rests mainly on Emeraude's recordings. Some time ago I asked, if two pingers rest on the ocean floor with some distance between them, whether that distance would help to locate them. I wasn't thinking about doppler shift, but perhaps I wasn't successful in making myself clear. This sketch explains my thinking:
Sub and pingers
Assuming that both pingers emit a pulse at the same time, the sub in position (1) would receive the pulse emitted by pinger B slightly earlier than that of pinger A. The time shift between the received pulses A and B would change in different positions of the sub relative to the pingers, would it not?
Regards,
HN39