The notepad method at the periscope/uzo screens is not reliable and difficult to use at best. Just my opinion.
I've written several responces to similar questions over the last couple of days on this forum that are in a good deal of depth regarding Angle on the Bow, Speed, and Distance.
Simply put, you must plot the target's course, make time and distance measurements over a period of time. Once course is plotted and an estimate of speed is determined, you can determine the angle on the bow of your intercept course with that of the target's course. Input AOB into the notepad with the periscope/uzo at a zero bearing. As you aim the periscope/uzo at the target, the correct AOB will always be computed and submitted to the Target Data Computer. Now, enter the estimated speed directly into the TDC on the Attack Screen so that the torpedo offset angle will be computed by the TDC.
Distance is not critical to the TDC's computations. Distance only affects the stopwatch's time to impact when the torpedo is fired. That said, you want to estimate the distance at time of firing to the intercept point along the target's course. I usually estimate the distance at between 500 to 800 meters because that is the general distance I'd like to be in when I finally fire. And don't forget to open the outer doors prior to firing; unopened outer doors will cause a delay in firing and thus a miss.
Look for my other posts for more detail. Hope this is helpful. I use these methods to hit targets in excess of 5k meters.
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