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33. The head of the arrow on the transparent disc (this will be called the "G. S. Index" in the future) is rotated to the Course on the underlying disc. The Wind Angle is then read on the transparent disc over the wind direction.

34. Example 13. 

Given: Course and Wind Direction
Required: Wind Angle

A pilot is flying a Course of 236 degrees with a NNE wind. What is the Wind Angle?

(a) Set the G. S. Index to 236 on the underlying disc.

(b) Over NNE on the underlying scale read the Wind Angle of 146 degrees. This is a quartering tail wind.

35. GROUND SPEED AND WIND CORRECTION ANGLE. These two quantities may be solved in the same operation when the Wind Angle, Wind Velocity and True Air Speed are known.

36. Example 14. 

Given: Wind Angle, Wind Velocity, True Air Speed
Required: Ground Speed and Wind Correction

A pilot knows that the Wind Angle is 146 degrees(Para. 34), Wind Velocity 45 miles per hour, True Air Speed 180 miles per hour. He wishes to know his Ground Speed and Wind Correction Angle.

(a) Turn G.S. index to 0.

(b) Make a pencil dot at intersection of 146 degree curve and 45 miles per hour line.

(c) Rotate disc until dot lies over 180 miles per hour airapeed [[airspeed]] line.

(d) Read Wind Correction Angle, 8 degrees on curve under dot.

(e) Read Ground Speed, 216 miles per hour, at head of arrow.

37. COURSE CORRECTION. In applying course corrections simple rule to remember in determining the Heading is:

RIGHT WIND ANGLES ARE PLUS.
LEFT WIND ANGLES ARE MINUS.

This means that: