A project quite similar to my proposal Guidebot which unfortunately I couldn’t get enough interest in the project to get some budget to take it beyond a simple exhibition poster. It’s great that Richard Etter was able to take something similar, and likely more capable, and make it real. His project is likely a far better fit for the the Fraunhofer Institute for Applied Information Technology than mine was for where I was working at the time. Fraunhofer investigates human-centered computing in a process context.
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.