I will add that the earlier assertion that the searchers were incompetent because they made 3 hour turnarounds instead of a "racetrack" pattern was quite off base.
They were using a racetrack pattern, one that kept bringing them back to the target area where they wanted to focus the search. The way they did it gave them maximum time over target; they varied the depth of the UAV as they turned so that they could get back to the target area sooner with the UAV at the correct depth.
If they would have just kept running in a circle or oblong search pattern they would have searched a greater area, but would not have spent much time over the target area.
This whole business of armchair admirals questioning the technical expertise of the kinds of people who have designed and built vehicles such as Ocean Shield and the ULV (as well as the Inmarsat systems) seems a bit daft to me.