>As an avid OpenStreetMapper I honestly wonder what kind of data is missing in OpenStreetMap. Is that something sighted persons cannot grasp and thus not add to OSM? Have you seen.

Thank you for providing that link — it was helpful. The information I want to display is text-based rather than graphic-based. My plan is to have two systems working in tandem: physical hardware placed in areas of interest like bus stops, intersections, etc., and a user interface that queries this data. The UI will be entirely text-based, with an absolute minimum of graphics.

In the future, if this project succeeds, I aim to launch my own GPS satellite to bypass Google’s predatory API calls.

Yes — but in Phase 1, the map will be text-only to ensure accessibility. What I envision is a sort of Wikipedia for my entire city, where every landmark and point of interest is cataloged and annotated in a rolling fashion, allowing others to edit, expand, and improve. Kind of like Google Reviews — except not owned by an advertising company.