Hi nquantum
I'd suggest using narrow band via your towed array to locate subs. Narrow picks up before broadband waterfall gets a sniff of a sub.
You'll need to get familiar with frequencies to help ID a sub bid you're hunting Russians you'll often get a hit on the 50hz line well before broadband wakes up. Remember to use the towed though.
Hope this helps. I learned everything I know by watching FPS Shaltzy (can't spell his name, sorry) YouTube clips.
Hope this helps.
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