>Is there something for the blind yet that
>can be worn as a cap and gives 'audible
>notice' of impending danger as well as
>assists in navigation/negotiation of common
>obstacles like street crossings and doors?

Well one of the lecturers at University of Canterbury, New Zealand had an
ultrasonic ranging unit for blind people as a pet project back in the
1960/70's. Do not know what became of it.

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