Calibrate the tilt sensors in the receiver
The Calibration screen appears only when you are connected to a receiver that has built-in tilt sensors.
To view the Calibration screen, tap and select Calibration. You will also be prompted to calibrate the receiver the first time you connect to certain receivers; you can start the calibration from the notification banner that appears.
Well-calibrated tilt sensors are essential for accurate results. Trimble Mobile Manager provides a number of calibration routines, depending on your receiver: