"It was slightly strange at first," Wächter says, "though on the bike, it was great." He started to become more aware of the peregrinations he had to make while trying to reach a destination. "I finally understood just how much roads actually wind," he says. He learned to deal with the stares he got in the library, his belt humming like a distant chain saw. Deep into the experiment, Wächter says, "I suddenly realized that my perception had shifted. I had some kind of internal map of the city in my head. I could always find my way home. Eventually, I felt I couldn't get lost, even in a completely new place."
ryanguill writes: "Wired has an article about expanding your five (maybe six) senses to allow you to sense other things such as direction. It also talks about hijacking other senses to compensate for missing senses, such as using electrodes in your mouth to compensate for lack of eyesight. Another example is a subject wearing a belt with 13 vibrating pads. The pad pointing north would vibrate giving you a sense of direction no matter your orientation: