Do you really fly a perfect circle of constant radius? I certainly
don't. I think without that, the wind calculation is really a best
guess based on the assumption that you're flying a circle. One could
argue that an accurate wind calculation is necessary to fly the correct
drift angle to your target, but this is soaring. Who flies in a
straight line?

On 9/18/2016 10:05 PM, Tim Taylor wrote:
Actually in some conditions it is very easy. Stop and circle. I find in mountains and along shear lines that the wind can change 30 to 180 degrees in a very short distance. Many traditional varios and computers will take 10 to 15 minutes to adjust.

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Dan, 5J