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Given the following information, calculate the heading T and groundspeed:

TAS: 200 kt
Track: 110°T
Wind velocity: 015°T /40 kt

  • A
    Heading: 121°T, groundspeed: 199 kt
  • B
    Heading: 097°T, groundspeed: 201 kt
  • C
    Heading: 121°T, groundspeed: 207 kt
  • D
    Heading: 099°T, groundspeed: 199 kt

Refer to figure.
Determining Heading and G/S with the flight computer:

(1) Place the centre of the rotating disk on the value representing the true airspeed (200 kt).
(2) Place wind direction (015º) under the true index.
(3) Mark wind velocity (40 kt) upwards 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 your true track (110º) under the true index.
(5) Slide wind Velocity mark to True Air Speed (200 kt);

  • Ground Speed reads under centre => 199 kt;
    WCA reads between centre line and wind velocity mark => 11ºL.


Using Wind Correction Angle (WCA) and Track, determine Heading:
Wind Correction Angle (WCA) is the angular value opposite to the drift angle, and it refers to the heading angle correction in order to keep your aircraft in the desired track:
  • Therefore, True Heading = TT - 10ºL = 110º - 11ºL = 099º(T)

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