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Saturday for that two-hour period. that says we are in the right area. >> david, what kind of further research can be done on those last pinger locations if they're within a 17-mile radius? what can researchers do and searchers do with that last bit of information to try to pinpoint a pinger or a black box, whatever originated that sound? >> well, there's a couple of things. we talked about triangulation before and when you have one point, you have a straight line to work with, so if you put circles around that, put that two-mile stretch within the three-mile dome or so, two and a half-mile do...

>> i think we're past satellite imagery at this point. any debris field that might have been floating is not -- very far from there. i think it's possible the pinger to reduce the search field, to concentrate where to look for it next. >> i want to show you the latest flight map that we have that shows what the folks from kuala lumpur and elsewhere think the plane did which was, we pretty much know it headed west and then south. this trajectory was given to us saying that the plane flew deliberately outside of indonesian radar. how then do we know where it went? if it's outside indonesian rada...

Around those pinger locations because that's the only other bit of evidence that we've got. once we do that, then we'll move into the next phase, which is to work out whether there is something nearby the pingers, whether it's verified or whether we need to go to a much wider area around the pingers. >> rob, van, bob, mary, thank you. appreciate that. next, we speak to a man who shares his perspective on the search. hear why james cameron says the ocean depth is not the only problem. gunderman group. gunderman group is growing. getting in a groove. growth is gratifying. goal is to grow. gott...

David. is it possible with your experience with these units that it can actually record more than two hours, or do you know for sure it's strictly two? >> it records over it again. they made sure what was on there before is not retrievable. >> here's my question. how long before they find the black boxes? >> you know, i hate to speculate on behalf of the families. i want to qualify this and say -- >> you have done this before. you know a reasonable amount of time. >> absolutely. what i would say at this point being that i trust the pinger location is a real ping, i would say within the next fo...

Today's search update from the joint agency coordination center. big headline there, there have been no new acoustic detections in the past 24 hours but the search for the elusive pings continues. australian vessel, ocean shield, combing waters with american towed pinger trying to detect any signals. hsm echo by its side. efforts by air as well, stralgian sstralg i australian surveillance planes over head. it has to be said it has been silent since tuesday. no new pings since tuesday. authorities have said they will exhaust efforts until they are absolutely certain that those black box batteri...