TAS sin(wca) = WS sin(wd-trk)
TAS = True Air Speed
wca = Wind Correction Angle
WS = Wind Speed
wd = Wind direction
trk = Track
so 6.315 degrees or so to the left because
100 sin(-6.315) = 11 sin(0-90)
But in real life, I do MaxDrift times the clocked angle rounded to the nearest 5 degrees because the wind forecast is never right anyway.
PS just a PPL, not an FI, sorry.
