The Swingbyte app will ask you to recalibrate as necessary during your session. You can also do a manual recalibration at any time your Swingbyte is connected in the app.
iPhone: tap the Swingbyte icon in the top right corner, then select Recalibrate
iPad: tap the gear icon in the bottom left corner to open the settings menu, then select recalibrate
Android phone: Select menu > settings > recalibrate
Android tablet: Select menu > settings > recalibrate