1) I figure that the depth at which your fully submerged is around the 12-14m mark.
2) Its a game feature that shouldn't be there, its just its hard coded so I dont know of any mods to remove it. Seems anything deeper than 10m and you can pick up enemy contacts, so long as they're within 20km of you, you can hear them. 20km is the hard coded sensor effectiveness range. I actually abused this last night to track a convoy towards Rockall so I now have their course I'm going to reload a previous save and intercept. Weather on patrol is god awful.
3) I've noticed this too, and yes if the weather gets bad enough it can and will sink merchant ships or even DD's. I came across a convoy one day wending its way south towards me in god awful weather, 3 of the 4 escorts were sunk or sinking by the time they reached me due to weather damage.
4) The wind will always be coming from the direction he states, eg if he says 180 its coming from 180 etc etc. Can always watch the waves if you want to get a sense of wind direction too.
Feel free to correct me if I'm wrong on any of that guys. I'm not sure about it myself.
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