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Calculate the true heading and GS using the following data:

True course: 188°
W/V: 260/90
TAS: 420 kt

True heading and GS are:

  • A
    True heading 176°, GS 402 kt.
  • B
    True heading 176°, GS 439 kt.
  • C
    True heading 199°, GS 455 kt.
  • D
    True heading 200°, GS 383 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 (420 kt).
(2) Place wind direction (260º) under the true index.
(3) Mark wind velocity (90 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 (188º) under the true index.
(5) Slide wind Velocity mark to True Air Speed (420 kt);

  • Ground Speed reads under centre => 383 kt;
    WCA reads between centre line and wind velocity mark => 12ºR.

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, heading = TT + 12ºR = 188º + 12ºR = 200º

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