Found that the NDV code after a visibility is making AS set incorrect vis.Example:EGPL 122150Z 16008KT 0900NDV OVC001/// 07/07 Q1011With this met the vis is set above 10SM wich is wrong.NDV is means No Directional Variance or something like that. Basically it means that the instrument is not capable of detecting varying vis depending on direction.Hope you can find a fix for this ;)

Hi JT,Will point Damian to this.Hope this helps,Jimhttp://www.hifisim.comhttp://sales.hifisim.com/pub-download/asv6...development.jpg http://sales.hifisim.com/pub-download/asv6-banner-proud.jpg

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Thanks Jan, Fixed..-Damian