Community written Attackdisk manual. Should be somewhere in the download section here.
https://www.subsim.com/radioroom/sho...d.php?t=126824
Edit: GWX does not have attack disks in it. The most sophisticated 'sliderule' in it is the nomograph. (to compute time, speed, distance problems) You need mods on top of it that are compatible. Magui, ARB and the older Ujagd and OLC mod are the ones that have them to my knowledge.