You're not going to get within 3 miles of most subs in SC or DW without being counterdetected. Against something sucky like a Victor you might be able to, but in most cases you'll want to hit him from far enough out that he has no chance of returning fire accurately.
I think it was Ramius who captured screenshots of BB traces showing signal increases representing tube doors opening. I'd defer to his opinions if he disagrees with anything I say on this subject, but I can say with confidence that getting a BB trace on a sub in DW is very rare, and I've never noticed a transient at NB for anything less than a weapon launch.
__________________
|