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Calculate the true track and the ground speed using the following data:

TAS: 163 kt
W/V: 130/30

True track and GS are:

• A
True track 246°, GS 182 kt.
• B
True track 264°, GS 149 kt.
• C
True track 244°, GS 149 kt.
• D
True track 262°, GS 182 kt.

Refer to figure.

Using the flight computer:

(1) Place the centre of the rotating disk on the value representing the true airspeed (163 kt).
(2) Place wind direction (130º) under the true index
(3) Mark wind velocity downwards from the centre. It can be done from arbitrary positions, only magnitude is important. (i.e Vw = 30 kt, if centre is on 163, mark wind on 133).

NOTE:

When the question provides a track => mark wind velocity upwards from centre.
When the Heading is known => mark wind velocity downwards from centre.

(5) Read the Groundspeed of 182 kt and a drift of 8ºR.

Using drift angle and heading, determine track:
Drift angle is how many degrees the heading is to the right or left of the track. Always remember that the drift angle is always measured with reference to the heading.

• Drift Angle: 3ºL
• True Track = True Heading + drift angle
• True Track = 254º + 008º = 262ºT

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