Hi peeps, thanks for the replies.
I set the depth to 5ft and set on mag-det. I aimed more-forward than usual, even though the speed was 0 knots. I got 4/4 hits.
Ok, this patrol was a practice.
The manual says to set the torp depth to draft+5ft or so - this obviously does not seem to work.
I obviously need to get the hang of this manual TDC lark.
I am running the Stock 1.5 game on 100% realism. I have also added extra menu buttons, BP360, and the nomograph.