The tilt measurement function can eliminate the trouble of alignment and greatly improve work efficiency. Due to the characteristics of IMU module, the initialization state may be exited during the tilt measurement process. Therefore, the following should be noted during the tilt measurement process:

1) If the device remains completely stationary for an extended period, reinitialize it.

2) If the device rotates rapidly on the centering pole (more than 2 revolutions per second) or is poked hard on the ground, reinitialize it.

3) If the tilt measurement icon indicates “Not Initialized” or indicates low tilt measurement accuracy, reinitialize it.