Thanks friend. I found this last night
Visual range factor=0 ;[>=0]
Visual fog factor=1 ;[>=0]
but its strange. sh has three types of fog horizon: max, medium and low. I believe that this is not a condition may act on all three types of weather.
Ok inside the very strong fog officers did not see almost absolutely nothing. However, in the medium fog they report a ship from far enough. Specifically looking for this condition. It regulates the detectability of the three types of fog
regards
ps. What is ObjectRelativeZmin, ObjectRelativeZmax? Maybe this is the main problem