waypoint that was programmed into the flight management system, it will go into the mode where it will fly the last assigned ground track and keep going on that heading until essentially what will probably happen or may have happened, until the airplane runs out of gas. it wouldn't require inputs. it's an automatic mode. the boeing and rockwell and honeywell built into that system and that's what it will do. >> that's a good question. that is being talked about. the next one is for you. this tweet from marie. she writes what is the range capabilities of the black box ping. how close would a searcher have to be to hear it? >> pretty close unfortunately. depending upon the conditions, to three miles maybe. they have to go back across it. that's why they sometimes use submercibles. under water vessels to hear the wing. we know the battery life runs