Yeah. At the end of the day, it always is about gettin ahead of the convoy to prey on it from below. I never saw reason to give up this kind of approach, favoring other methods. US subs had the radar advantage that contemporary countries would have only closer to the end of the war. With it, you can't miss. German skippers would not have this advantage, thus being forced to follow convoys from visual distance and eventually be forced to risk a dangerous aproach.

I wonder if British subs ever got radar....I've never read up on that. Chances are, us Brits likely plastered all our surface ships with Radar instead so that no U-Boat could ever get close without detection. And the aircraft too. The Royal Navy as the war started turning against Germany actually sent out dedicated Hunter-Killer groups comprising of 3 or 4 destroyers who's only purpose was to pursue and sink enemy U-Boats.

The war against u-boats was a first-priority issue for the british, being necessary to say that it was the only thing that, as churchill admited, made him his sleep (though this kind of braggant commentary is tipical of his bold style of narration). This meant they dumped huge ammounts of investment in developing anti-sub technology. By the early years of the war they already were very developed in terms of ship-bourne and aircraft-bourne radar systems.