According to Dick O'Kane in Wahoo (p78),
"great emphasis was placed on slender periscopes that are difficult to see....you can't have it both ways: our small-tipped scope (the attack scope) was good into twilight, and the larger (search scope) into brighter nights....ours was a defect that could not be rectified overnight"
So US subs were pretty well blind after twilight unless there was strong moon/clear nights. They made their night attacks on the surface.
If the SH4 developers have done their homework, this should be simulated at higher difficulty (I seem to recall seeing a 'realistic sensors' option).
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