U-boat conning towers were designed to be as low as possible, so as to be hard to detect by other ships. By contrast, the bridges of warships, as Sailor Steve says, are designed to offer the best view.
This had the natural consequence that the view from the U-boat was reduced to about 8 km (5 miles).
However, this is not the whole story, since the U-boat watch could often see the smoke from a ship or, especially, a convoy at much greater ranges. Thus the 16 km view is not wholly unrealistic. It has also the effect of appearing to populate the oceans with more ships than you would normally see in the sparsely-populated SH3 world, since you are viewing a radius-squared universe (area of circle = pi x radius x radius). To my mind, this seems to be overall more realistic.
But, as Vodkajello pointed up, the 16km radius does put a bigger strain on your computer.
Stiebler.
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