it's not just the pings. it's also the inmarsat satellite data. it's the radar data. and it's the pings. three separate analyses which all coalesced in this particular area. the way i look at it is the pings are a microscope that give us a more probable location for the airplane. but even the pings define a large area which has to be surveyed with sonar. so i believe that they're looking in the right place. i would not be surprised if they found the record soon. if they don't, they're going to regroup. not start from the beginning, and move on to the next area. >> now richard, on this issue of the inmarsat data and how crucial it is in terms of whether they found the right place, i'm going talk to sarah in just a moment. one of her questions, what is the statistical probability of the inmarsat calculations being accurate? there are still a lot of questions out there that all this backup data has not been released.