Refer to figures.
Drift
Drift angle is how many degrees the heading (HDG) is to the right or left of the track (TRK). For example, a drift of 5° right means that our heading is 5° to the left of the track, to counteract the incoming wind from the left.

CALCULATION OF DRIFT
We can use a flight computer (CRP-5) to calculate the drift using the following steps:
Steps 1 - 3 (Figure 1)

1. Set the center to your True Airspeed (TAS) of 90 kt.
2. Bring wind direction of 290° under the “TRUE HEADING”.
3. Mark a dot at the wind speed of 15 kt BELOW the center, at 75 kt.

Steps 4 - 7 (Figure 2)

4. Bring true track of 320° under the “TRUE HEADING”. 
5. This value will result in a drift of 6° R (+).
6. Decrease value under “TRUE HEADING” by 6° so that the difference between HDG and drift results in a TRK of 320°. This is achieved at a HDG of 314°.
7. Read the drift of 5° R (+) and a Groundspeed (GS) of 77 kt.

Therefore, the following results are obtained from the flight computer:

• Drift: 5° right
• Heading: 314°
• Groundspeed: 77 kt