> This helped me out , not sure if it's what your looking for ...
> http://www.x-plane.org/home/robinp/Apt850.htm

Just a minor correction. AFAIK we are (still) using the older 810
format, of which a document is available here:
 
http://www.x-plane.org/home/robinp/Apt810.htm

Regards,

Gijs





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