Secure sharing in head worn computing

A secure data transfer method, comprising:

• a. identifying a second head worn computing system (“HWC”) in close proximity to a first HWC, wherein the step of identifying the HWC includes comparing a geo-spatial location, represented by GPS coordinates, of each of the first and second HWCs;
• b. determining that the first and second HWCs have viewing angles that are substantially aligned, of opposite direction and positioned such that they are predicted to be facing each other, wherein the substantial alignment is determined by a comparison of compass headings from each of the first and second HWCs;
• and
• c. causing information to be shared between the first and second HWC.