The photo in the OP is from my collection from a private visit to 505. In German it was called an “Entfernungsmelder”. Different than the kmotmeter (which was called “Fahrtmessanlage”).
I agree, kilometers would be fine to use. The real device based its output on speed through the water (from the knotmeter’s “pitot tubes”) and time. So I think the game one should be based on same if that is possible.
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