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Given the following information, calculate the ground speed for the following situation, using a mechanical computer.

Track: 264°(T)
TAS: 480 kt
Wind velocity: 190°(T)/50 kt
  • A
    463 kt
  • B
    473 kt
  • C
    469 kt
  • D
    453 kt
Refer to figures.
For this question, using your Flight/Nav computer apply the following steps:
  • Place the centre dot over TAS 480 kt.
  • Rotate the disk until wind direction 190o is under the True index.
  • Mark wind velocity 50 kt below the centre dot.
  • Rotate the disc until the track 264o is under the True index.
  • Wind Mark has moved to 6o right drift.
  • Set Track 264o under 6o right drift on the Drift Scale.
  • The Wind Mark has remained on 6o right Drift and heading 258o is under the True heading Index.
  • The mark now shows a Groundspeed of 463 kt.

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