This looks very interesting… I wonder if they target cyclists because it’s easier to get a reliable heading vector - and thus enable full position and orientation-aware binaural audio? Unfortunately I don’t have an iPhone to try it out on…
Navinko is a social networking service for urban cyclists and pedestrians currently being developed as an iPhone application that uses a unique audio interface.
Through Navinko, the experience of urban discovery is enhanced by giving clues about the location and proximity of friends and groups of cyclists, as well information about points of interest (POI).
Through hands-free voice control, a user can also record and share information relating to their urban dicoveries.
Through the use of a non-intrusive audio interface, users can both interact with the city and other users in an intuitive and safe manner.
Find out more here: http://navinko.com/