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Calculate Wind Correction Angle WCA and GS using the following data:

True course: 353°
W/V: 260/35
TAS: 160 kt

WCA and GS are:

• A

WCA 13°R, GS 154 kt.

• B

WCA 13°L, GS 158 kt.

• C

WCA 12°R, GS 166 kt.

• D

WCA 12°L, GS 163 kt.

Refer to figure.

Solving from Heading (HDG) & Ground Speed (GS), knowing WV, TAS and required track.

1. Set wind direction to 260º under the "TRUE HEADING" index at the top.
2. Set the center point on the True Airspeed (TAS) of 160 kt.
3. Mark the wind velocity 35 kt down from the centre point.
4. Initially, set the True Track to 353º under the "TRUE HEADING" index.
5. Note that this heading would result in 13ºR drift and a track of 006º.
6. Reduce the heading value under the index until the heading plus the drift gives a track of 353º. This occurs at a heading of 340º with 13ºR drift.
7. The groundspeed for this track is approximately 158 kt.

Wind correction angle (WCA) is the angle (º) between the Course and the Heading that is required for the aircraft to track that Course when there is wind. Wind Correction Angle is the same value as drift but it is applied in the opposite sense: (-)13ºL WCA

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