Deployment of ADV Ocean Shield
Bear in mind that the Ocean Shield is not an especially fast vessel (RAN lists its speed as 16 knots; as-built it was much happier at 12 knots) so the voyage from its base in Sydney to Fremantle is going to take the better part of six days. Add bunkering time in Fremantle, and another three or four days to get to the search area, and the wrong end of the 30-day pinger life of the FDR is looking unpleasantly close.