I found this photo (public domain) of the sonar station on an Arleigh Burke and I wonder how these things may work? It's far different from familiar waterfalls and they look nice and spatially intuitinal... I mean, the reason for which I sticked with the Akula throughout Sub Command.
Unless they are active sonar displays? The pic was marked as "surface anti-submarine sonar" and it seems that they have narrowband displays below so I don't think so.
http://www.defenselink.mil/dodcmssha...7981E-830a.jpg