Good point. OLC suggests the stabilised periscope view is a reasonable approximation of the ease real commanders had. Because they too had a split-prism mechanism in the periscope as the Americans had and is modelled in Sh4. (except that it could also rotate 90 degrees for AOB measuring) With that split-prism you have 2 identical images of the sea and ship moving up and down in the same rate. It would be alot easier for your eyes to follow it and put one mast on the waterline of the other. Than to keep the waterline leveled (by hand-eye coordination) and also measure the height of the mast. Keeping your eyes at 2 places at the same time is very difficult.
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