How Compasses Work by Marshall Brain.How to Find True North Without a Compass.

How GPS Receivers Work by Marshall Brain and Tom Harris.

How GPS Phones Work by Tracy V. Wilson.

GPS for the visually impaired. From Wikipedia, the free encyclopedia

BrailleNote GPS. CTEVH Workshop, 2006. Maya Delgado Greenberg, Orientation & Mobility Specialist Jerry Kuns, Technology Teacher

BrailleNote GPS vs. Trekker 2.0. : February 2, 2006 | Dennis van der Heijden.

ACCESSIBLE GPS FOR THE BLIND: WHAT ARE THE CURRENT AND FUTURE FRONTIERS? Presenter Michael May

GPS Technology for the Blind, A Product Evaluation, by the NFB’s Access Technology Staff.

Product Evaluation: Getting from Point A to Point B: A Review of Two GPS Systems. Jim Denham, Jay Leventhal, and Heather McComa

SEAMLESS OUTDOOR/INDOOR NAVIGATION FOR BLIND AND VISUALLY IMPAIRED Michael May.

Thread Index for gps-talkusers.

Yahoo Group: GPS Trekker.

Currently Available Electronic Travel Aids for the Blind. Duen Hsi Yen.

Electronic Travel Aids for the Blind Introduction. Duen Hsi Yen.

On Electronic Travel Aid Design. Duen Hsi Yen.

Getting acquainted with Talking Signs®

TALKING SIGNS® LOCATIONS IN SAN FRANCISCO Compiled by Theresa Postello, Bill Crandall and Jerry Kuns

Talking Signs and The Accessible City Reginald G. Golledge. Department of Geography and Research Unit on Spatial Cognition and Choice
University of California Santa Barbara.

Proceedings of a Symposium on Consumer, User Agency, Researcher, and Commercial Experience with Talking Signs and Related Technologies. Sponsored by The Smith-Kettlewell Rehabilitation Engineering Research Center. Supported by The National Institute on Disabilities and Rehabilitation Research
and The Smith-Kettlewell Eye Research Institute. San Francisco, California. June 27, 1995

Speech Intelligibility of the Talking Signs. John A. Brabyn, Ph.D. and Lesley A. Brabyn, M.A.. Smith-Kettlewell Institute of Visual Sciences
San Francisco, CA.. Journal of Visual Impairment and Blindneness, February, 1982.

An Evaluation of "Talking Signs" for the Blind. LESLEY A. BRABYN and JOHN A. BRABYN. The Smith-Kettewell Institute Rehabilitation Engineering Center. San Francisco, California.

The Effect of Receiver Beamwidth on the Detection Time of a Message From Talking Signs, an Auditory Orientation Aid for the Blind. Bo N. Schenkman International Journal of Rehabilitation Research 1986, vol. 9(3), 239-246.

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