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a locator system be moved into the area to help find the recorders. it's a listening device put into the water to help find the pings of the recorder. it's not very useful until you have a debris field. it can't be picked up by human ears but listen to what it sounds like. now, this is a very difficult search with so many obstacles. ian is a professor of ocean nothing gra fee at florida state. you've given us maps to look at to show where the possible wreckage could be if the debris spotted on march 16th could be confirmed as part of the plane. explain this map that we're looking at with the plotted points with the red and black ones. what do we see? >> the best way to find the