I have watched Werners remarkable video through a couple of times and have the links to the other videos bookmarked and that has me somewhat ready to try a patrol.
The question I have is where is this thing called the note pad! I have the TDC panel on the left and input dials/torpedo panel on the right but I don't see an X on any of them.
The reason I am asking is I had worked myself into a decent approach to a convoy and during a periscope check I found a destroyer had aligned itself for a perfect snap shot. I wanted to quickly convert the periscope to a point and shoot deal rather than the TDC info on the merchant I had entered. turning the red tracking button off did not seem to reset the speed and all that already entered.
I have seen some threads describing a non TDC shot but this one was not planned. Since the manual mentions an X on the note pad and I have seen resetting the TDC mentioned in the forums I Just need to figure out this notepad thing!

I assume it is a nomenclature issue with me but I just cant see it.