Still trying to understand this issue.

I post-processed again with the option "Base-Rover + Base & Rover CORS Processing" which as far as I understand is essentially what RTPK is doing (CORS processing rover points). This didn't seem to change anything.

My base station point is 125000.1, with a "Post-Processed with CORS Data" coordinate of:

N: 2,137,965.6468

E: 5,990,082.4234

U: 13.4865

When I look at my rover points I see several coordinates: Current, Base Station, Survey Origin, Base Station Origin, Post-Processed Origin, Base Station Origin Post-Processed.

Base Station, Base Station Origin, and Base Station Origin Post-Processed all have the same coordinate.

Comparing the "Base Station Origin Post-Processed" coordinate to 125000.1 above:

N: 2,137,964.8782

E: 5,990,082.8550

U: 13.6517

this is a difference of

N: 0.7686

E: -0.4316

U: -0.1652

Or a horizontal distance of ~0.88' in a NW/SE direction, which matches the shift we're seeing at the rover points.

Does this mean the RTK vectors are originating from a different coordinate than the post-processed base station?