http://richardetter.com/index.php/melodious-walkabout/

“A variety of navigation systems have been developed that use a GUI-based interaction style. However visual navigation systems are often inappropriate in the dynamic mobile context since the user has to watch the device and cannot keep his eyes on his surrounding environment. Auditory navigation systems are more convenient, mobile users can easily interact with the system and are not visually distracted. But most auditory systems navigate the traveler by using precise spoken instructions and speech requires high attention.

The approach of Melodious Walkabout is that explicit instructions are not necessary to navigate a person. Melodious Walkabout is a wearable system that implicitly guides a user by providing him with awareness where the destination is located. It navigates users in a completely new way. It doesn’t use speech and allows the user to listen to his own audio contents while being aware of the location of the destination […]”