Sorry, but not really a fan of this idea at all.
Getting accurate stadimeter ranges at extreme rages "should" be difficult, and "is" useless, because you wouldn't hope to get accurate solutions at those ranges anyway. You can get a general idea of what's going on, then further refine it as the target gets closer and become easier to observe. By the time the target is 2000-4000 yards away, then you can conduct a series of observations accurate enough to fire a torp.
Artificially adding a visual aid to make long range stadimeter settings accurate is obviously unrealistic. It's along the same lines as the hated old red triangle. We don't need that.
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