Compare TAS to GS to obtain the HW/TW component (250 TAS - 220 GS = 30 kts
HW, which also agrees with the estimate). Draw horizontal line along appropriate
value (Figure 4.6-9).
Figure 4.6-9 In-Flight Wind Calculation 6
Rotate the compass rose so that the intersection of the two lines is on the vertical
scale (Headwind scale).
The direction of the wind is read on top of the TC arrow (090°). (Figure 4.6-10)
The magnitude is determined by using the same scale from steps 5 & 6, in this case
43 kts. (Figure 4.6-8, 4.6-9)
Verify the estimate.
Figure 4.6-10 In-Flight Wind Calculation 7