Wind Corrections

[fmullin]

When "Analyzing Wind..." after a ride, you can either accept the tool's calculation of "Avg. Ground Wind" or enter your own value for that term or "Wind Offset."
Suppose I run the wind offset in setup before the ride to bring that value to 0.
Then at the end of the ride I check the wind offset in setup again and find that it is now some non-zero value (say 4.0).
Can I use this information to improve the wind correction? For example I could enter 4.0 as the Wind Offset, or perhaps 2.0 as the average wind offset during the ride.
Would this give me a more accurate result or am I trying to get more accurace than is possible?
I ask this because I am impressed how the tool uses the combination of elevation sensor and tilt sensor in the tilt analysis to make some pretty profound adjustments.

[travispape]

When "Analyzing Wind..." after a ride, you can either accept the tool's calculation of "Avg. Ground Wind" or enter your own value for that term or "Wind Offset."
Suppose I run the wind offset in setup before the ride to bring that value to 0.
Then at the end of the ride I check the wind offset in setup again and find that it is now some non-zero value (say 4.0).
Can I use this information to improve the wind correction? For example I could enter 4.0 as the Wind Offset, or perhaps 2.0 as the average wind offset during the ride.
Would this give me a more accurate result or am I trying to get more accurace than is possible?

Actually, yes, that should work. Just to be clear, the number that you see in the wind offset page of the iBike setup is really a pressure reading in Pascals as is the wind offset box in the "Analyze Wind..." window, so you would want to enter that 2.0 in the "wind offset" box rather than the "Avg. Ground Wind" box, which is either in mi/h or km/h.

Also, you might want to enter 4.0 instead of 2.0 depending on the source of wind offset error:

* If the end-of-ride wind offset was 4.0 because you forgot to do a wind offset at the beginning of the ride, I would enter 4.0.
* If the end-of-ride wind offset was 4.0 because the unit was too hot when you did the wind offset cal, I would enter 4.0. (If the unit was too cold at the time you did the wind offset, you would expect to see a negative wind offset at the end of the ride.)
* If you did a good wind offset cal but the end-of-ride wind offset was 4.0 because the temperature cooled throughout the course of the ride, I would enter the average value of 2.0.

[rruff]

I ask this because I am impressed how the tool uses the combination of elevation sensor and tilt sensor in the tilt analysis to make some pretty profound adjustments.

Yes... it's cool how the elevation sensor can be used to check the tilt sensor. They should match, provided that the barometric pressure doesn't change much.The wind seems to be trickier though. If you do a loop or out-back course you can expect the avg ground wind to be close to zero, but this isn't a sure thing. The wind speed and direction can vary quite a bit.

I did my first ride with the unit calibrated, and I got an avg slope of .18% and an avg ground wind of -.2 mph on a 32 mi loop. The starting and ending elevations were within 2ft also. A good result I think.