Submerged, 700-800m in early war and you rarely miss (unless your torpedoes are duds or malfunction). Usually means you can hit 2 ships in convoy with same attack (by firing first against someone bit further and then giving the good news to your intended target).
Also, if you get within 1.5-2km without being detected, you can usually half the distance with little patience unless enemy is moving away.
Well, I play NYGM, but early war convoy attack is for me: Sneak close to 800m (preferably inside the convoy lines), fire at 2 targets (3 if there is ample target for stern tube). Dive and turn to follow the course of convoy while reloading, in hope to pick stragglers. And pray you won't be picked up by escorts in process...
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