It's an interesting angle, and has the potential to add value on a large scale. Assuming I would cough up the dough for an iPhone that could do this (big, big assumption), I don't know I would trust it with my life.

My skeptical side follows the technology dependence trend. How many people will assume this is an automatic link to rescue, and place themselves and SAR folks in jeopardy? Dunno, maybe I'm just being grumpy.

Speaking of grumpy, I'm not convinced that a whole bunch of twinkling rubbish messing up my view of the Milky Way constitutes progress. Hrrmph!