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Given :

TAS = 95 kt
HDG ( T ) = 075°
W/V = 310 / 20 kt

Calculate the drift and GS.

  • A
    10L - 104 kt
  • B
    9R - 108 kt
  • C
    8R - 104 kt
  • D
    9L - 105 kt

Refer to figure.
Finding ground speed vector (drift angle, ground speed):

(1) Place the centre of disk on your TAS (95 kt).
(2) Place your true heading (075º) under the true index.
(3) Mark wind velocity (20 kt) downwards from centre.

NOTE:

When the question provides a track => mark wind velocity upwards from centre.
When the Heading is known => mark wind velocity downwards from centre.

(4) Place wind direction (310º) under the true index.
(5) Read ground speed and drift angle (note: Drift angle will be to the opposite side then marked on the flight computer) under the wind mark:

  • Drift: 9°R, groundspeed: 108 kt

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