Recalibrations are possible, but not required. The Xsens sensor fusion algorithms for VRU, AHRS and GNNS/INS devices can cope with offsets.
The gyroscopes' turn-on to turn-on bias stability (also known as bias repeatability) is typically up to 0.5 deg/s for the MTi 1-series and up to 0.2 deg/s for the MTi 10/100/600-series. Above these values, the accuracy of the sensor fusion outputs may deteriorate.
If you are in doubt about the calibration of the MTi or if you would like to request a recalibration, please contact Support. Recalibrations outside of warranty will be subject to costs as described in the RMA Terms & Conditions.