As anyone who has ever missed a freeway exit while relying on navigation software can tell you, even at its best GPS is something of a guess. With a margin of error of around a few feet, GPS is can be decent enough for guiding cars on roads, but the wide range limits GPS to environments where a few feet of difference isn’t a huge deal. A new, hyper-accurate system, developed by researchers at the University of Texas at Austin, can upgrade GPS accuracy from a few feet to a few inches.
