see this news story, out today...

Radio tags give guidance
September 24/October 1, 2003
By Kimberly Patch, Technology Research News
http://www.trnmag.com/Stories/2003/092403/
Radio_tags_give_guidance_092403.html


        'The Rochester team has reversed the standard radio tag setup by
    making the receivers mobile and the transponders fixed; the
arrangement provides information at certain points in space. "We
reversed the usual application of fixed reader and... portable tag
to... use fixed tags to let a person know where they are," said Jack
Mottley,....' .. 'The system, dubbed Navigational Assistance for the
Visually Impaired (NAVI), can provide location information for the
visually impaired and for other kinds of navigational assistance
applications like self-guided tours.' ... 'The system could be a
low-cost alternative to global positioning system-based schemes for
providing location-specific information and pedestrian navigational
assistance.' .. 'For applications for the visually impaired,
transponders could be mounted near key points like hallway
intersections. For tour applications, transponders would be mounted
near items of note, and near places where people might need directions.'
...
' The system could eventually be used in self-guided tours of places
like museums'



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