a hand-held, it is good equipment, sensitive but really deployed for shallow areas, not the depth you're talking about now. i think finding pulses and verifying pulses are critical. the new ship coming in the british ship with more sophisticated gear would really help out. what you need to do is get those pulses in a very consistent manner. it will tell you if you are seeing pulses from something like aircraft pingers and recorders but it won't verify. you can't verify until you really hone in on beacons and pingers and get to the bottom to see what it really is. >> if the chinese say they were able to detect the sound twice, one time for a minute and a half. you're saying with this kind of equipment perhaps the british ship has on board, it would be in a position to get a more consistent sound for a lengthier