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Given the following information, calculate the W/V:

True track: 095°
TAS: 160 kt
True heading: 087°
GS: 130 kt

  • A
    237°/36 kt
  • B
    057°/36 kt
  • C
    124°/36 kt
  • D
    307°/36 kt

Refer to figure.
Finding unknown wind:
Four variables must be known: Track, Heading, TAS and GS.


Follow the steps detailed below in order to find unknown wind:
(1) Place the heading (087º) under the true index.
(2) Place the centre of the rotating disk on the value representing the true airspeed (160 kt).
(3) Determine the drift:

  • Drift or drift angle, is the angular difference between the track of the aircraft and its heading. Keep in mind, to determine the drift the reference is heading to track.
    In this case, Heading is 087º and the Track is 095º, therefore we have 8º right drift.

(4) Place a mark (in this case, the end of the line) at the intersection of the arc representing your GS (130 kt) and the drift (8ºR).
(5) Rotate the disk (azimuth) until the mark is located on the centreline below TAS.
(6) Read wind speed (difference between the centre and mark on the centreline) and direction (under the true index): 057º/36 kt

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  • Austro Control
  • United Kingdom