Nisgeis assures me that the real American TDC would let you link the two to automatically update AoB, but that our game does not allow it. Most curious choice there! I'd love to have that direct hook-up in a convoy situation, although tale shows in his video tutorials that as usual there are workarounds that work just fine.
That difference in the way the game TDCs work is why we came up with the Dick O'Kane Technique. We were trying to adapt U-Boat Fast-90 shooting to the fleet boat. When I came up with a way to make it work I wanted to call it Fast-90 until a couple of vets from SH3 hit me about the head with cudgels and finally made me believe that Fast-90 used a unique aspect of the U-Boat (in the game) TDC that directly linked periscope and TDC. Without that link I shouldn't call it Fast-90 or we'd just confuse everybody on the American side of the war (not difficult to do anyway).
What's really interesting is that you can do a Dick O'Kane in a U-Boat but you can't do Fast-90 in a submarine. But meeting a couple of U-Boat captains months before I ever drove one of those things with foreign words all over the periscope, stadimeter and TDC

, was the beginning of my whole collection of constant bearing, longitudinal spread attack techniques. Oh, they DID think I was dumb. But they couldn't conceptualize the American TDC at all, while I understood just enough about the German TDC to make the technique work.