Distance in Manual Targeting
The most important factor is accurate target speed followed by an accurate Angle on the Bow (AOB). I don't believe target distance is used by the Target Data Computer to determine the offset angle of the torpedo from dead center of aiming point. However, torpedo speed (slow, medium or fast) would affect the offset angle of firing and the distance of torpedo travel before giving out.
This is all a function of geometry. Given a set target speed, AOB and torpedo speed for any sub to tartget distance the offset angle of the torpedo track would be the same I do believe.
However, accurate sub to target distance will affect the notebook's computation of target speed if you use this method to determine target speed. If you do not use this method for computing target speed, I don't think accuracy of the distance is too important.
For example, if you were to use the Weapons Officer assistance to compute torpedo firing angle, you would notice that it gives you the immediate sub to target distance, not the sub to torpedo intercept point which you are looking for.
All that being said, compute the convoy speed and AOB (because all merchant ships in the convoy will have the same speed and AOB). Estimate the distance to the furthest target. Aim periscope/UZO and shoot at the farthest target and then at the closer target.
Then you best "RUNN OFT" before the destroyers and frigates come for ya.
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