Answers
1) you look at it - here's a trainer i wrote
http://www.subsim.com/radioroom/show...light=tutorial
2) you use the U-jagd tools mod 1.3 for stock SH3 from the link in my sig
3) you plot the target course and then you use the protractor tool to show the aob which is the angle between the target course and you along the reciprocal line of sight bearing.
4) you don't do this - instead you plot the target course, set a perpendicular intercept course for you. Set your scope straight ahead, go to the TDC station and set the AOB to show 90 port or starboard, whichever is true for the target when it passes in front of you. Turn on the TDC again, and your TDC is now programmed for action. Your AOB is correct so long as neither you nor the target change course
hth
joe