Notice Advisory to GLONASS Users (NAGU) Updated 19 April 2018 10:39 Follow A periodic bulletin alerting GLONASS users to changes in system performance. Related articles How do I upgrade the GLONASS option on my Topcon GNSS Receiver? What Geoid model is used within the Verify-QC software? How do I check the GNSS receiver firmware version on my LD7? What RTCM messages are used by the VERIPOS services and what latencies are acceptable? Ionosphere Comments 0 comments Please sign in to leave a comment.