The MEOSAR network includes GPS, GLONASS and Galileo; plus the Chinese are supposed to be supporting with Baidou at some point. I doubt the occasional downtime

The MEOSAR network includes GPS, GLONASS and Galileo; plus the Chinese are supposed to be supporting with Baidou at some point. I doubt the occasional downtime on some of the Galileo birds would make a large difference. In any case, I think the MEOLUT ground segment for MEOSAR is distinct from the GNSS ground segment.