Stryd is designed to be accurate out of the box and often does not require calibration. There is some variability across devices and runners, and it is unusual to see devices that are off by more than 3%. Depending on how you use Stryd, you may be able to fine-tune the accuracy of your data.
1. You must compare distance measured by Stryd with a known distance. We recommend you head to the track and measure it with a measuring wheel as even certified tracks can be off by up to 1%.
2. After you have tested your Stryd, the next step depends on your device:
- Most Garmin and Polar watches allow you to set a calibration factor.
- The Stryd app on the Apple watch allows you to set a calibration factor by going into settings. The math: (1 - Measured Distance / Actual Distance) * 100%
- Suunto watches do not allow a setting a calibration. You can try to look for an open road that is straight and long enough to run about 15 minutes. Suunto can autocalibrate Stryd, but you be relying on the Suunto GPS. After calibration, your Stryd will be accurate in places where GPS is less reliable such as wooded areas and around high-rise buildings.
- Currently, there is no way to set a calibration factor within the Stryd app on your phone. The development team is considering functionality to allow users to set a calibration factor on Stryd.
3. If you find that your Stryd is off by more than 3%, please contact firstname.lastname@example.org.