You dont enter in the bearing of the target ship as the tdc already knows this due to the fact that the periscope, and uzo are directly connected to the TDC. Here is the relevant quote from my faq on the first page second post.
Quote:
What exactly is Angle off Bow (AoB)?
To put it simply, its the measurement of your bearing (180 degree left or right mesurement) from the perspective of the ship out to your Uboat. Imagine your standing on the bridge of the target ship looking out at your Uboat, the angle from the bow of the target ship your standing on to where your looking out at your uboat is the Angle off bow.
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Factors that have no effect on the target's AoB is its bearing to you, your speed, and/or your course.
Ill also give you 2 graphical examples of AoB
Code:
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X target ship
O
| Your uboat
Ok in this example the target ship is heading south, the uboat north. The AoB is aproximatly 45 degrees left.
Code:
X target ship
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--O Your uboat
And in this case the target ship is heading north and and the uboat east. The angle on bow roughly is 135 degrees right. Notice that the heading, and bearing of your sub have absolutly nothing to do with determining AoB?
Understand now?
As for knowing where our torpedoes hit, well we usualy watch and see where they blow up. As for knowing about where to aim at, well that comes from practice, also our understanding of the damage model (or the use of mods which change the ID book in game to show where specific compartments are on the ship's picture).