Vuzix Wrap 1200VR User Guide - Manual (Page 28)

 Put on your eyewear or place them in the position in which they will be used – upright,
at eyelevel and facing your computer – and then press the “Set Zero” button.
The Set Zero button establishes the Tracker’s home or centered position. As you move your head
you will see the indicators and values in the Yaw, Pitch and Roll indicators reflect movement
relative to that centered position.
Drift
Some degree of drift on the Yaw axis is normal.
The Wrap Tracker provides an auto-centering capability that will automatically compensate for
most drift while the Tracker is in use. Occasionally, before starting a session you can use the Set
Zero button to re-center the Tracker for optimum calibration. You do not have to go through the
entire calibration process to use the Set Zero function.