There are hints here and there in some books I have readed about tables, wiz-wheels and pre-calculated stuff, none of them is 100% conclusive about the periscopes, but it is very clear that the Kaleun and IWO had those helps for several tasks so it seems reasonable that they had it also for these quick calculations.

I can show pictures of torpedo manuals that have many of those tables for several purposes, like parallax correction, LUT runs, etc.

Also, in many pictures of U-Boat interiors (Specially the conning tower) you can see many small books that were at hand for consulting when the kaleun sat at the scope or at the bridge.

This material is sadly difficult to obtain :damn: