The Android demo app is ready for review in its preliminary form. Sorry had no chance to polish it well, broke my shoulder, but it should work to most of what we discussed. See the details here https://github.com/halxinate/gyronav There will be a list of files / folders there above the readme file content, just click the app-release.apk from your phone to download and install it (the rest is for developers). Your phone must be set to allow installing from unknown sources first: System Settings / Security / Unknown Sources / Check