WiFi provider Aruba Networks used to offer retailers and others “blue-dot” indoor navigation using WiFi triangulation. However Apple’s recent decision in iOS 8 to randomize the iPhone’s MAC address changed all that — and may have effectively killed WiFi as an indoor location technology. Beyond this, WiFi is expensive and requires significant IT involvement. Beacons by comparison are cheap and don’t implicate IT infrastructure to the same degree. Now, in an industry first, Aruba has developed viable indoor turn-by-turn indoor navigation using beacons and a process called “trilateration.” The company didn’t invent trilateration but to my knowledge it is the first company that has successfully implemented it in the real world. Trilateration is like triangulation except with beacons instead of WiFi or cell towers.