Why not just take one look with the periscope and mesure distance+ mark your position on the map. Than change course and use the hidrophones to track the bearing to target+ mark your new position.
If you do this a couple of times (more is better) you can calculate speed, AOB and distance from the map (it can even be done without any periscope observation at all) in other words just good old TMA fiddling
Of course because this IS WW2 I personaly just take a couple of periscope readings and use the 3:15 rule to get solutions because a few priscope peaks never gave me away so far- and if it works why bother complicate things
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