Working OK on a ZTE T86 with Android 10
Some quirks at least with this one so far that may help others get started:
The app needs all permissions
Needs at least initially to see satellites to get past the Garmin logo with bouncing triangle.
Any additional maps or voices added/deleted, then needs a phone re-boot after each change before they are recognized in the app settings.
Works OK with Garmin City Nav, Topo or DEM .img with any custom name in Garmin\Map.
Custom names not recognized in Garmin\System
Doesn't appear TTS voice compatible. Won't accept the newer TTS3 voices files, TTS2 & TTSv can be selected but are silent. Use VCT.
Vehicles even if selected, may need to be re-selected to actually be enabled on screen. E.g. select another vehicle then come back to select the original one you want for it to be displayed instead of the default blue triangle.
Edit: more detail on voice files
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