On full manual, I've always had difficulty lining up anything other than a 90deg attack, with a 10deg bearing to target and an 80deg Aob ... I'd mainly guess at the Aob on off-angle shots and invariably miss.
Anyway, I got off my a**e, looked up some old posts on the subject and made the two whiz wheels referred to mainly in
http://www.subsim.com/radioroom/show...ght=whiz+wheel and in the manual targeting tutorial (Wasserman). It took some slogging as I'm math-challenged, but I've figured out so far as being able to get the Aob using the cavalier wheel to get true bearing to target and then using the coloured wheel from the Wasserman tutorial to get the Aob.
Tried it out yesterday for the first time during a night convoy attack and got a couple of hits on off-angle attacks, entirely due to having a better handle on the Aob.
Highly recommended.