Hello. I also raised the topic in this thread Check known controlpoint with ntrip?. The distance to the ntrip mount point was 4-5km an error of 8-10cm shouldn’t happen but I read on the site of the ntrip service provider ASG-Eupos that GNSS measurements may be difficult due to the peak of the 25th cycle of the sun and the ionosphere influence. it is possible that this was the cause of the shifting of the “running” of the instrument. we will collect more data on this and we will definitely share the conclusions. Regards, Damian