【實用交通運輸app】MIT Tunnels|最夯免費app-綠色工廠好玩App

GPS signals are carried through waves at a frequency that does not move easily through solid objects. Applications that use GPS to get the user’s location don't work properly indoors or don't work there at all. This app solves this issue by determining the location of a device using the list of available WiFi access points. This method is applied to the map of MIT tunnels.