Amee
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Does anyone know how many additional "laps" the Ocean Shield has done since the one where they heard the 15-min. pings?
this link doesnt say how many laps but it does explain how its done and the time it takes per leg
The focus is on trying to re-acquire the acoustic signal that they had 24 hours ago. In terms of area, by the end of tomorrow when they've completed their runs, they expect to have a three by three mile box searched. So, it is quite a small area that will be searched very thoroughly but it is a very small area and it gives, I hope, some sense of the challenges that they're facing out there.
Keep in mind each of the runs that they conduct, is around seven miles long with the turn at the end and it takes quite some timearound seven to eight hours to do each leg and to do the turn at the end. They need to steady on the new course and allow the Towed Pinger Locator to complete the turn and settle down so it is a very, very slow and painstaking process.
http://www.jacc.gov.au/media/interviews/2014/april/tr007.aspx