WT901C RS232| manual v0707 | http://wiki.wit-motion.com/english
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2.3.4 Reset Z-axis Angle
Note
：
If you want to avoid magnetic interference, you can change the algorithm
to Axis 6,then you can use reset function of “ Reset Z-axis angle”.
The z-axis angle is an absolute angle, and it takes the northeast sky as the
coordinate system can not be relative to 0 degree.
Z axis to 0 is to make the initial angle of the z axis angle is relative 0 degree.
When the module is used before and z - axis drift is large, the z - axis can be
calibrated, When the module is powered on, the Z axis will automatically return
to 0.
Calibration methods as follow: firstly keep the module static, click the “Config”
open the configuration bar and then click “Reset Z-axis Angle” option, you will
see the the angle of the Z axis backs to 0 degree in the module data bar.
2.3.5 Reset Height to 0
Only available for the module built-in barometer like WT901B, HWT901B,
WTGAHRS1, WTGAHRS2.