For the most part it’s a very smooth position point movement as seen below, which is odd. Perhaps it’s just slight atmospheric differences and changes between here and the CORS that cause this smooth and and gradual drift.
Here is what the above plot looks like zoomed in with the position points:
The reason I was confused is poster Steve Zeets said he got within 2cm horizontal and 3cm vertical after 20 minutes of log:
And I don’t know how he got this 2mm accuracy plot that is a tight cluster (no line here):
But I’m guessing the 2cm horizontal and 3cm vertical is likely because he was only 5.1km away from the CORS. But I still don’t know what to think about that 2mm tight cluster plot?