Disclosed is an eye-start system that includes a light source adapted to be housed within a viewfinder of a device, and a light sensor also adapted to be housed within the device viewfinder, the light sensor being configured to sense light from the light source that reflects off of a user looking into the viewfinder. With this system, light reflected off of the user is sensed by the light sensor and, upon such an occurrence, a device action is activated.

 
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> Estimating position and orientation in electromagnetic systems

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