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How to Create an Airspace File

This is an abbreviated defintion of the OpenAir (.FAS) airspace format (which works for most flight instruments) and description of how to create an FAS file to define a custom airspace. An alternate format called SUA (Special Use Airspace) exists which I will not go into here.

Definition

Header Information: I would recommend creating entries with information in the order it is presented in this list though I do not know if ordering matters.

Drawing Definitions: This is information used to draw the airspace and I assume it draws the lines in the order it is written. Co-ordinates need to be written as <lat> N <long> W (or similar) however co-ordinate formats appear to support at least these types DD.dddd, DD:MM.mm, DD:MM:SS. Longtitude degrees must be 3 digits so for 2 digit longtitudes it would be '085'. Minutes and seconds must be 2 digits long so instead of writing '5' you would write '05'. For DD.dddd, it appears to support at least 13 digits of precision (13 digits after the period) however ALL co-ordinates must be the same length in the list, basically all the 'N's and 'W's should line up nicely in the list. The default format that is used for co-ordinates is DD:MM:SS which looks like '31:55:16 N 087:03:15 W'

Sample



Creating Your Own Airspace File

Resources