That does help, thank you.
Just to be clear (sorry for all the questions) - when I enter range, speed and AOB, I should already be in a position to attack at the point where the the target will pass in front of me.
So - if I then say, follow a course change from the target, I would have to re-enter the details on the TDC (F6) screen despite the fact range, AOB and speed would all still be correct?
And - If I were floating around still on my way to my planned attack point and was not facing the correct direction yet, and at this point entered AOB of 90 degrees, when I arrived and faced the correct direction, any data entered would be useless?
Finally - The bearing setting (which I understand does its thing automatically now) is attached to the sub compass, and this is the reason that AOB cannot simply be set to 90 degrees at any time, because this would ultimately skew the results if not already in the desired position?
If all three of these are correct, then this is my problem. I was missing the connection of the other settings to the bearing, assuming they were independant. I have been setting AOB to 90 degrees before getting into the firing position, and wondering why on earth the bearing indicator isn't pointing at around zero degrees when I arrive at my attack location, which of courseon changing, changes AOB at the same time.
This would also explain why the notepad method was getting constant hits, yet the TDC screen was not, as using the notepad I was re-calculating having arrived at my final ambush point.
Think I just had a major 'duh' moment.
Assuming the above is correct, I'm off to try it now.
::edit - sorry, I forgot to add. I did do a manually targeting tutorial, but only with the notepad, so I wasn't flying entirely blind.