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They did have these wheels though, I suppose they could be used in "emergency" if the stadimeter didn't work, or even only to take a quick target speed reading. Hitman would sure know better, but I think these wheels may have been used on early u-boot (in Iron Coffins the author mentions two different types of attack scope mounted on the VIIC ?).
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Yes they had, and they had them in fact since WW1. In the Vessikko scope you can still see the graded wiz-wheel system of the old scopes.
Werner refers in Iron coffins to two modesl of scopes, the first one is the older, classic one that goes up and down and is rotated manually. That one had the wiz-wheels externally. The second is the fixed-heigth-of-eye periscope that can be seen f.e. in the film Das Boot, where the commander sits in a saddle and operates the scope electrically, with no need to go himself up and down to his knees. This model had the same wiz-wheels and split prism system, but it was internal, being readed through the eyepiece in a partition.
Germans estimated the AOB as the americans, but mainly when being surfaced. Since the periscope makes you lose some of the depth-perception in objects, the wiz wheel served as an aid to determine AOB when doing a periscope attack.
