Fog density in GWX 3.0 Gold?

[Shkval]

Last night I hit one of my own , but that's all because of BDU's idiotic orders and fog off course ... first they send me in AN 31... I think 20 or so hours off my base (Wilhelmshaven). IXB cross-Atlantic sub in my own backyard? For God's sake send TypeII there!Operation Weserübung is even over... it's May 15-th! So I sit in front of blue colored towns - ports and waste my time with my own TF's hanging around... then I hear a merchant getting closer... I doubted it could be my own but I fired anyway...
Now the question, is fog in GWX gold less dense than in vanilla SH3? I had a pretty good sight of a merchant just before I fired... unfortunately i didn't have time to check the flag who I couldn't see trough periscope, but it seems to me that visibility in foggy conditions in GWX gold is about 1 km? As far as I remember in vannila was about maybe 400 meters...