Just been browsing one or two other sites and they are saying that hydrophones could detect convoys up to 100k away and that on a good day you can see over 20k by eyeball. My guess is, they would submerge maybe every 100k looking for convoys and possibly sometimes pick-up smaller, closer targets by chance when doing so. What I'm looking to do is get as near as possible, within the limitations of the game, to the real behaviour of a u boat patrol and I'm debating with myself whether or not to consider some of the grey box contacts as picked up by periodic stop, submerge, listen techniques rather than actually submerging and doing the listening myself.
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