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I'm just wondering how the real Uboot sailors determined target range?
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When submerged, using the periscope split prism stadimeters (early models) or reticles (late war models)
When surfaced, using plain naked eye estimation and some references as help, like: Amount of lense covered by the objective, hull cut or not by the horizon, etc.
In the real life UZo there was no range measuring tool built in. Distance was estimated by naked eye, but since all attacks where done as close as possible this did not matter much except if shooting with large gyro angles.