Probolly been mentioned in the monsterous 8 pages, but could it be made so that active sonor detects large underwater rock formations and mountains/cliffs(there are plenty in real life), and mabye make it so if a submarine purposely runs aground will be very hard to detect by active pings?-and i didn't know about the collant thing, so shouldn't something happen when a nuclear sub runs aground?
and btw- i laid about 5 active and 1 passive CM's, and the computer(chinese frigate) completely ignored them and started firing deck gun at me

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and last, the active pings are way to accurate, that same chinese frigate got me from 6 nmi away, heading at 15 kts, it was a recreation of the "chinese survailance" on SC, shouldn't it act the same?