I have to say, GWX3 seems to model the visibility thing quite well. I only played stock SH3 a few times before installing GWX but it seemed like destroyers could instantly spot anything within 4-5km. Nowadays, provided it's dark and not too calm, I don't have a problem sneaking around destroyers at about 2000m or so.
I've come within about 800m of lone freighters and not been seen. Compares well to what I've read about U-boats dashing in and out of convoys.
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