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That this is according to data that was shared by the malaysians with u.s. investigators so there could be more information we're just not privy to. but the information shared was just the co-pilot's phone. and we know that standard operating procedure is for passengers and crew to turn off their cell phones when a flight takes off. why was the co-pilot's phone turned on? >> pamela brown reporting with the latest news for us. just ahead we'll dig deeper into this new phase of the hunt for flight 370 as investigators hope an underwater sonar device will help locate the plane on the ocean floo...

>> numerous transmissions recorded, which gives us the high degree of confidence that this is the black box from the missing flight. what we are now doing, given the signal from the black box is rapidly fading, what we are now doing is trying to get as many detections as we can so that we can locate -- so that we can narrow the search area to as small an area as possible. >> the prime minister added once the search area is narrowed down, a sonar device will be deployed. stay with cnn for the latest on flight 370. we'll be right back. four-wheel steering is why i get up in the morning. [ matt ]...

With the sonar type system you could actually map much larger areas. >> david miller is the president of a company that helps to map the world's oceans and seas. >> despite the fact that 70% of the world is covered by ocean, only 5% of our oceans have been explored to date. >> this is a side constant sonar device, tossed to the water off san diego. to give us a look at what is under our boat. >> all these little rescctangul spots? >> this is shallow water, what can you see in the deep, this amazing amount here, the underwater vehicles glide through the deepest ocean depths in the world with th...

>> reporter: all of the searching so far up in the south china sea over the malacca straits into the edge of the southern ocean has been part of just the first search. the search for one solid clue to tell them where to look underwater. the search above water can be fairly fast. we're off the coast of australia now, they've been moving through those areas over there that they've defined and redefined and moved them around. they can search maybe 90,000, maybe 100,000 square miles in a day because they can fly over it and look. but when you talk about diving down into the water, when you talk ab...

Just the first search, the search for one solid clue to tell them where to look under water. the search above water can be fairly fast. we're off the coast of australia now. they've been moving through those areas over there. they've defined and redefined them and moved them around. they can search maybe 90,000, 100,000 square miles a day in one of those areas because they can fly over it and look. but when you talk about diving down into the water, when you talk about getting deeper down under the surface there, it gets much more complicated and far, far more time-consuming. let me show you w...