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Given the following information, calculate the drift and groundspeed:

TAS: 465 kt
Heading: 124°T
Wind velocity: 170°T /80 kt

  • A
    Drift: 3°L, groundspeed: 415 kt
  • B
    Drift: 4°L, groundspeed: 400 kt
  • C
    Drift: 8°L, groundspeed: 415 kt
  • D
    Drift: 6°L, groundspeed: 400 kt

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

(1) Place the centre of disk on your TAS (465 kt).
(2) Place your true heading (124º) under the true index.
(3) Mark wind velocity (80 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 (170º) 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: 8ºL, groundspeed: 415 kt

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