the first place. that's an important design feature. that's a good thing but it does take more time. we really are doing this backwards out of necessity. that we don't have a debris field where we're trying to pinpoint it. but rather we're casting a wide net and hoping to find it before the batteries go out. >> let's say a battery does go out, shawn. we just heard a few minutes ago from one expert who said they need to reacquire the signal. but i guess if the battery goes out is there enough information in what they have already been anyone to gather to help lead them to the right location if this is indeed from the airplane. >> that's a really challenging question. i think it will be based on the