Well, there was no broadband from sonobuoys too, only hot (red) buoy's, which can mean anything - sub or surface contact.
I didnt knew, Does really buoys transferring sounds, or You talking about ship acoustics?
At this moment seems like range is only helping to distinguish Biologicals, but that means You gonna need waste some buoys just to confirm its not biological and dropping them +- 50nm i guess from hot buoy.
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