Vuzix STAR 1200 User Guide - Manual (Page 28)

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§ Put on your eyewear positioning them as they will normally be used –
upright, at eye level 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.