1) Yes, but you are then at risk from being visually spotted and from radar whilest surfaced! keep your distance while surfaced, at 6km you should be ok so long as they dont have radar.
2) pretty much as soon you hear them you are in trouble and the depth charges never lie! The Ai never make random pings like real Escorts did, In SH3 they only do it to pin-point you after they are already aware of your presents.
3) Fairly accuate! (but not 100%) it tells you how detectable you are and not weather you really have been detected.
You may have been at silent running @ 1 knot but at what depth? anything less than 150m and you can be discovered pretty easily.
4) From what I have heard no it does not effect it (i could be wrong here).
5) Other than what you mentioned it can be used to purchase a whole new Uboat type - thats all.
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