Looking for Indoor GPS

A long time goal.  Some of the research generally  described here.  Completely personalized navigation indoors is still not here. Coming to an office this morning it took fifteen minutes to get a Wifi connection.  Useless for shopping or alerting.  Beacons won't be everywhere soon.  And you wont need satellites: " ... Labs in the U.S. and U.K. are working on next-generation GPS that’s so cool, it won’t even use satellites. It will instead take location cues from subatomic variations in the earth’s magnetic field .. "