I've seen these threads too but had not encountered any ships in fog on my first patrol with GW so I couldn't see what they were talking about. I finally ran across some last night - shadowed two freighters in the densest fog/lowest visibility for several hours of game time, stopping for sound checks every 30-45 miniutes or so to see how things were going - finally pulled off a perfect intercept as they came sliding out of the fog/mist at about 400m, dead in my sights. Unfortunately, it was a pair of Brazilian ships (a coastal and a light tanker), and it was only July 1941, so I had to let them sail on back into the mist and disappear.
Frustrating encounter from a tonnage perspective, but good training for the newest members of my crew and very cool looking from the bridge - so, for me at least, the fog seems to be working just fine with Sh3 Commander and Grey Wolves (using the "16km dark" version).
3.2GHz P4
2MB RAM
Radeon X800XL 256MB
Catalyst 6.3 drivers
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