Ummm...
I would like to go on record once again to mention that when I first described and tried to mimic O'Kane's tactics. I did in fact use the TDC as I believe O'Kane did and it has always been somewhat a thorn in my side that it was dumbed down over time but kept the "O'Kane" monicker.
What people call the O'Kane method now is such a crude method it doesn't really do O'Kane justice.
http://www.subsim.com/radioroom/show...&postcount=134
...where I mentioned
"develop a solution for a 20° bearing (70° AoB)" I was using the TDC to do it.
In his book, O'Kane did the same thing as I described in the above post... holding the aiming wire constant and firing as target points passed the wire. It was just one attack that he documented in his book, doesn't necessarily mean he always did it.