welcome back to "new day." right now the u.s. navy's unmanned submersible vehicle, the bluefin 21, it's called is being deployed in the search for flight 370. it will use sonar, side-scan sonar, it's called to map the bottom of the ocean but where they start depends on what little information they know so far. let's bring in david soucie, cnn's analyst. the author of "why planes crash" and a former faa inspector to discuss what we know and what we don't know and where they're going to be, david. this all comes back to the pings. the pings that they don't know. this is the first ping they detected, the second, the third and the fourth. where is the search today? >> what they're going to do is focus on the first one because the first one was the long equivalent and most consistent. these others are most likely artifacts. they're other pieces -- these are the echo ones.