Found this interesting post on Fast Company about experimental personal wayfinding systems using the magnetic properties of indoor spaces and mobile devices. Obviously not ready for primetime, but imagine if implemented. All I can say is watch out…lost souls will be colliding everywhere!
Never Lost: MIT Creates Wayfinding Arrows Projected From Your Cellphone
MIT’s Media Lab Experiments with a New Idea in Personal Navigation That Works Indoors, Thanks to Maps of a Building’s Magnetism.