If you're playing with contacts on, you'll see ship icons and sonar lines. I assume you're playing stock...cough choke...and think stock shows blue for war, black for merchants. If contacts are on, make sure you set radar to the furthest range. As stated, eventually ships will come and you can draw lines plotting there course.
You should check out the sticky at the top "Skipper bag of tricks..."
Subs would never shoot that far. I've done the same thing, but you're not gonna get a lot of hits. I don't pause at long range, I'll shoot go to binocs and watch, adjust range. At that range it can take several shots to home in. In reality most subs never did anything close to that. Read of a few attacks at 6000 yards, but most were against small unarmed or lightly armed merchants, staying out of their machine gun range.
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