how confident are you? well, for the pinger itself, that s the towed ping locator, it will be a fairly broad reception bandwidth. therefore, it will certainly be able to receive 37.5, but it will receive signals at some distance either side of that. i think it will probably go down to about 10 kilohertz. if being transmitted, it will have received it. so david, if australian search teams do find the black box, let s say, what are the chances that they re going to find the plane as well? we ask that because you wonder how far debris spreads across the ocean floor. well, it depends of course on how the aircraft broke up in the first place. if it was a mid-air explosion or something, it could be spread for miles. if it s something that was caused by the impact on the water, it would be probably