Can someone elaborate on the formula GAG=GAA(airspeed +/- wind)/airspeed

I'm a little confused on what GAA is and if it's just a constant number. I
kind of derived it as being 30 degrees as a constant target of angle you
want to the touchdown point (?). it works for Tom Knauff's calculation in
his book with 50mph a/s and 30 mph headwind, and using 30 for GAA. but when
I reduce it to a 5 mph headwind the resultant doesn't come within the cone.
Am I missing something here?



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