>>22375
You are like half right.
As long as the submarines were hidden, they had the element of surprise and could choose to enter combat whenever they felt like. Why would they trade blows with a destroyer when they could pick off cargo ships? When they entered combat, they want to make sure they are pointed perpendicular to the other ship, that was they can fire their torpedo at the broad side of the ship. Sonar was still a new technology that only the allies possessed.
Only makes sense that the Uboats would try to use intelligence and other means to follow convoys around. What would the other option be, explore the Atlantic?
That said, the movie tried to do too much. Blowing up a uboat with a depth charge just to show the audience what a depth charge is was a little over the top. The Germans had decoys, but they were primitive bubblers. Taunting the convoy wasn't in the book and was just made up so the movie could have a climax. Also makes no sense, why would the uboat taunt a destroyer, destroyers sink submarines (if they can catch them)...
>>22362
>americentrism
I haven't seen the movie, what are you referring to specifically. It isn't supposed to be Das Boot, it is based on a British book on convoys called The Good Shepherd.