[habi]

> I aim to launch my own GPS satellite to bypass Google’s predatory API calls.

That might be a bit more costly than calling any API :) And launching own GPS satellites has no connection with Google's API as far as I know.

Are you interested in location data only? Then you can actually query https://nominatim.org/, which does the (reverese) geocoding.

> the map will be text-only to ensure accessibility.

I wonder how that's done, something like https://wiki.openstreetmap.org/wiki/Mapscii ?