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FOR AN ANXIOUS GENERATION
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these are s.o.n.a.r.s used for survey and mapping. these s.o.n.a.r.s emit sounds, pointed down to the bottom and then receive sound and look in different directions along the bottom to see what came back. so they re able to build all of that information up to make a map. . reporter: and let s take a look at what that map looks like. we ll go and show you exactly how this looks. so now starting off with which first? this one here. yeah, let s start over here. this is just an output from the hydrophone. you can listen to the hydrophone with your ears, an audible thing you know and listening for that one-second chirp. you could also look at a display like this, if there is a one-second chirp out there, you ll get a sudden jump in the noise spectrum. this is random otherwise from the ocean right now. when they get near that pinger, they ll see a clear spike where at 35 kilohertz. where that is. and on this side, you re mapping it out to see what s on the wow, that looks like a boat.