I use the same methods as Leandros and Pisces. proceed to a hot-spot area and submerge.
I tweak the speed to 80 revolutions (<1 knot) and go to x64 TC.
Following a short plotted course at 45 degrees to the likely track of traffic, I alter course every 15-20 minutes by up to 90 degrees either side of my mean course to open the hydrophone arcs and catch anything sneaking through the dead zones ahead and astern.
I check the hydrophones myself at least once an hour, normally more and yes, it is tedious but you will catch sounds the crewman won't.
Same when the boat is surfaced to recharge batteries between dips. I scan the horizon myself and have spotted targets out as far as 18.5km on a good day. Having a high definition monitor helps.
It all depends how much effort you want to put in. Unless 'warping' between hunting grounds I cruise at slow speed and never more than x64, frequently less. My patrols take longer to complete now but I catch a lot more fish this way than I used to.
KH
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