Probably not much use here, but one of the crazy blind Brits who set a land speed record used an inertial navigation system that was extremely sensitive and, if I remember correctly, rather than audible tones, it had two pager vibrators, one on either side of his neck. As he careened down the track, the vibrators would buzz if he veered off the centerline.
Just trying to add some color to the conversation. -- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: d...@andrew.cmu.edu Tel: (412) 268-9081
