With the risk of looking like I'm on house arrests if I was to wear something like this in the summer, I would love to have one for navigating new places.
My new sensory organ is a small anklet strap with a LiPo battery and circuit board attached to an electronic compass on the anklet's side. Inside the strap are eight small buzzers, up against my skin. As I sit here typing, the buzzer on the very left side of my left ankle is gently informing me which way is north. The anklet is called a Northpaw.