GPS (global positioning system) hardware enable people who are blind or visually impaired to navigate to a desired street address or destination. Some units provide route directions, while others use ultrasound to detect objects in the user's path and alert the user by vibrating or chirping as the person approaches the object. The vibrating or chirping feedback generally accelerates as the user nears the object.

Personal navigation device that can be used to determine location as well as plot routes to local businesses or a specific address. Also features an MP3 player, as well as a memo recorder and an FM radio. Can be controlled either by pressing keys, or by issuing voice commands.

Portable electronic travel device that uses ultrasound to detect objects to provide tactile or auditory feedback by vibrating or chirping sounds more rapidly as the user approaches an object. When used with a cane or dog guide, it can help a blind person avoid obstacles and overhangs, locate landmarks, locate items such as mailboxes or trash cans, and find paths through crowds at ranges from 20 inches to 26 feet. Has two large button controls; five default ranges (ranging from ½ meter to 8 meters); user-friendly advanced settings that allow user to select range presets, change type of auditory feedback, and manage optional remote unit; and a durable plastic case. Optional remote unit for instructors can receive the same tactile feedback as the student.