Developed by Jaewoo Chung at MIT's Media Lab, Guiding Light consists of a wearable badge with magnetic sensors and a software app that makes use of a projector built into many Samsung smartphones to cast arrows onto the ground in front of you as you walk.
The system relies on a map of the building based on fluctuations in its magnetic field, created by the presence of steel in the walls, floor and ceiling. In tests, Guiding Light was able to determine a user's position to within a metre.
— newscientist.com
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