We might not be ready for this yet: being guided without watching or listening to a gps device. Max Pfeiiffer of the University of Hannover created a device that directs electrical current into the sartorius (muscle in your leg). Your phone, storing the info of a path and measuring your current position, triggers the currents to your leg and makes you turn. Too SF for you? They tried it out on some students in a park in Germany,... and it works.
Source: NewScientist. Read more here
Picture; Ingrid Rasmussen/Plainpicture: