How do we calibrate the Notio in an indoor velodrome?

How do we calibrate the Notio in an indoor velodrome?

Here are basics guidelines to calibrate the Notio in an indoor velodrome.

Speed sensor
In the indoor velodrome, a magnet-based speed sensor is recommended over a hub mount for better speed accuracy.

Distance
The recommended distance to calibrate the device is 6000m. The rider must perform two sets of 3000m at threshold speed with two easy laps in between.

Calibration run
Start recording from the Training mode in the App or from your Garmin head unit.
Take a few laps to accelerate up to your threshold speed.
Ride 3000m*
Slow down for a couple of laps
Back to a threshold speed
Ride 3000m*
Take few laps to slow down, then stop
Stop recording in the App or from your Garmin head unit. If it stops from the Garmin, you must Save the ride to make the Notio stop recording (green light will pass blink to solid).

*Steadiness : all along the calibration segment, it is essential to keep the same line, be as consistent as possible in terms of speed, position and gear ratio.

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Golden Cheetah Notio
Download the data to Golden Cheetah Notio and create two intervals (one for every 3000 meters) removing the acceleration from the start and the deceleration from the end. It should look like this:



Correct the Altitude
Altitude deviation is a phenomenon that occurs in the velodrome. It can be caused by environmental factors such as barometric pressure, temperature or air density that may vary. While in a velodrome, you usually have a constant altitude. Your elevation does not change if you keep the same line and not go up or down in the corners. The drift phenomenon can be set in post-processing treatment in Golden Cheetah Notio. 

Top Menu -> Tools -> Altitude -> Constant (which equal to 0)

After selecting the constant altitude, it will automatically recompute the data and fix constant altitude to eliminate potential errors.
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Calibration factor in the Notio App
Select one interval and click on the " Estimate Calibration Factor ." It will return you the calibration factor estimated for that interval. Do the same thing for the second interval. You can then average the two returned calibration factors to obtain a good calibration factor. Once calculated, put back that number into the parameters in GC and the iOS APP. 


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