Date: 25. October 2009
Description:
This is a fix for the metric METAR bug aka "fog bug" in FS9.
FS9 has a bug in weather.dll, which causes it to interprid "9999" as a maximum visibility rather than "visibility of over 10km"
Usually this happens when there are some clouds in the area, whereas during CAVOK conditions visibility usually is over 10km.
In USA and Canada there has been no problem since FS9 interprids "10SM" correctly. (and anywhere else where visibility in metar is in miles)