LookTel Breadcrumbs GPS
LookTel Breadcrumbs GPS is a location and orientation app designed specifically for the navigation needs of people with visual impairments or blindness.
Using the iPhone as a pointing device, Breadcrumbs helps blind or visually impaired travelers locate orientation points, or "breadcrumbs", on a route. A breadcrumb can be dropped in your current location by simply pressing the "Drop Breadcrumb" button in the app. Then, when pointing your phone in the direction of that breadcrumb, the device will vibrate to let you know where the breadcrumb is.
The app enables you to create routes by dropping several breadcrumbs along a path, such as the walk to a local post office, making it easier to re-trace your steps later. You can also drop a single breadcrumb to find specific locations or landmarks, such as the entrance or exit at the local beach or park.
More information: http://www.looktel.com/breadcrumbs