Show "ephemeris" for each satellite
Created by: gdt
This may require the Android 7+ GNSS API, but I think that's ok.
Satstat shows a blue or red bar depending on whether the particular satellite is used in the solution. Another important thing is whether the ephemeris is current. I suggest showing a hollow bar to show no ephemeris. Really, I suggest hollow to show not used, solid for used, and red for no ephemeris, blue for ephemeris, but that's a bigger change. The point is to match what Garmin units do, but there I think tracking and ephemeris leads to use.
A curiousity is that gpstest shows that GLONASS satellites are sometimes/often used with almanac but without ephemeris. This seems odd, as I would expect the position computed from almanac to be so high uncertainty as not to be useful.