Navigation by the Seat of Your Pants
From: IEEE Spectrum - 10/30/2009
By: Anne-Marie Corley

Researchers are developing new ways to navigate, such as by stimulating the
bottom of your feet and your rear end with arrays of vibrating motors,
proving that humans can tell directions and sense patterns using unusual
parts of the body. The devices could be useful for gaming, virtual reality,
and collision avoidance or to aid the visually impaired. 

Read the entire article at:
http://spectrum.ieee.org/robotics/home-robots/navigation-by-the-soles-of-your-feet-and-the-seat-of-your-pants

Links:
Ramiro Velazquez
http://www.interaction-design.org/references/authors/ramiro_velazquez.html

Assistive devices
http://www.robotica-up.org/assistive.html