Welcome aboard jeffery7466. The issue w/ the tutorials is that your sub starts too close to the action. This gives you little time for a planning and proper approach.
In campaign for instance you would already have a firing solution/torps/tubes set up and ready to go before the convoy hoves into view.
Perhaps there is a single mission that will allow you more time to approach? I don't know as I haven't played any in so long. Maybe anothe old salt can suggest one?
