@MikeN - the app is working very well. OSM allows us to now give visually impaired users a huge amount of detail in their environment and it therefore increase their independence and confidence. I am UK based. I am sighted, and I now use Soundscape as an alternative to Google maps when I want to get somewhere. So it works for sighted people too. But, the app is only as good as the data around them based on OSM.
Let me know what you think when you play around with it. I am also happy to answer any questions if you have any.