I came across these articles and resource.
An article on the background of GNSS and then "What went wrong during
the Galileo outage?"
https://berthub.eu/articles/posts/gps-gnss-how-do-they-work/
An article on "The State of Galileo".
https://berthub.eu/articles/posts/state-of-galileo-and-accident/
Galileo/GPS/BeiDou/Glonass open source monitor:
https://galmon.eu/
Live observer map:
https://galmon.eu/geo/
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