You can calibrate your product while your session is recording.
To do so, proceed as follows:
- Starting from ALTI mode (altitude is shown on display), hold down the SETTINGS button (top right) for 3 seconds
- The altitude will start to flash
- Adjust to the altitude of your current location (obtained from a map or elevation marker) by pressing the buttons on the top right (+) or bottom right (-)
- Once you've set the altitude, exit the menu by pressing the SETTINGS button (top left)