I have trained myself to do none of that. I find a target and move to intercept on the surface. This works especially well at night and the British escorts are not nearly as tuned to seeing you as the Japanese seem to be playing the US side.
I get ahead of the convoy and sit 300-600 meters at a 90 degree angle from the track. I do not calculate speed, angle on the bow nothing. I also never set any torpedo to the fast setting no matter what fish it is. I wait usually at all stop and all quite until the escorts pass and my target ship comes up at 345 degrees on left right tracks and 015 degrees on right left tracks.
When the sip is at 345 or 015 respective of the track I quickly center the scope to 000 degrees and fire. I very rarely miss. If you think they are going a bit slowly than normal then fire at 10 degrees off 000. If they are going faster, as in a Carrier or other capital ship then you may have to go 20 degrees off 000.
I fire, I dive and I have normally come back up a short time later to hit another ship in similar fashion while the escorts are looking for me in the first location. They have a horrible time finding you in rough seas so it is a real advantage even in 1943 where I am now. I say why complicate things with so much math. You were born with an extremely quick processor for finding solutions. Your brain.
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