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Calculate the GS and drift angle given that an aircraft is following a true track of 048° at a constant TAS of 210 kt with a wind velocity of 350°T /30 kt.
  • A
    200 kt and 3.5° right
  • B
    192 kt and 7° left
  • C
    192 kt and 7° right
  • D
    225 kt and 7° left

Refer to figure.
1) Place centre dot over TAS of 210 kt.
2) Set Wind Direction (350º) under True Index.
3) Mark wind Velocity down (30 kt) from centre point.
4) Rotate the disk to bring the track (048ºT) under the True Index and read the drift of 7º Right;
5) To read Ground Speed, rotate the disk to put the heading of 041º (Track - Drift) under True Index, read off a Ground Speed of 192 kt.

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