I don’t use the stadimeter so I’m not sure about any bugs. But keep in mind that, if you set up your shot so the gyro angle is low (say within 30° of your bow), meaning the torpedo won’t turn much or at all, range won’t matter to the solution. Prewar scopes had a stadimeter device, but it is for the above reason that wartime periscopes removed this feature, and also because target parameters like length and height were seldom known or relied on. Course and speed data was typically gathered on the surface at long range by either matching the target’s course and speed, or by plotting using rough ranges based on how much mast was showing above the horizon.
In practice, if range needed to be determined at the shot, usually for situational awareness, it was estimated using the vertical scale in the periscopes, or also by how much the target filled the lens horizontally (the prevalent method with the UZO, which only had a vertical line). I would suggest practicing this type of eyeball method, and also striving for a low-gyro shot whenever possible to mitigate solution errors caused by inaccurate range.
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