A “dataless” Wi-Fi positioning system that can be used anywhere GPS can’t. Blecky @ hackaday.io writes:
The SubPos Wi-Fi Positioning System is an indoor positioning system that can be used in various environments such as metro lines, shopping malls, carparks, art galleries or even conference centers; essentially anywhere GPS doesn’t penetrate. It could also be integrated into an array of IoT enabled devices, from access points to Wi-Fi enabled light-bulbs.
SubPos – Wifi enabled Positioning System – [Link]