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NAGU
NAGUs (Notice Advisory to Galileo Users) are alerts about activities/events that impact the quality of services offered by the Galileo system. These alerts can be planned, responding to recurring activities/events, or unplanned, arising from an unforeseen anomaly in the system.
NAGUs can be "Unclassified (UNCLA)," accessible to any user through the GSC (European GNSS Service Centre) website, or "Classified (CLA)," which will be automatically sent to authorized users based on their need to know.