consumption, the data, i have said all along if you're confident that the pings are from the black boxes, how do you leave the area and even think about someplace else? >> david said tonight, what if that information the authorities relied on to define the search zone, what if it is just wrong? the inmarsat data is certainly controversial, and as randi kaye reports, this is not the first time a search plane has gone off course based on bad information. >> reporter: it is september, 2007, steve fossett takes off from the flying ranch in nevada. heading out he promises to be back for lunch and nobody sees him. >> the best way to describe it, looking for a needle in a hay stack, within ten hours.