| CPC G02B 27/0176 (2013.01) [B64D 11/0015 (2013.01); G01C 21/10 (2013.01); G02B 27/017 (2013.01); G02B 2027/0198 (2013.01)] | 20 Claims |

|
1. An apparatus, comprising:
a display comprising a first sensor mounted on a headband, headgear, or helmet; and
a second sensor mounted on the headband, headgear, or helmet and configured to transfer align with the first sensor.
|