Hi Dane,
When setting up base at a control point, we use the autonomous position we get from the receiver and the control point's coordinate to calculate the distance between the receiver and the control point. If the distance is more than 500m, we display that error message.
So the issue could be the control point is wrong or we are not getting the correct autonomous position from the receiver. Please try a few things to get things sorted:
1. Make sure they you're selecting the correct new control point.
2. Before moving the base to control point, use a rover to do a system recheck on the new control point to make sure it's at where it should be.
3. Try to do a base setup with LLH HERE option and then just redo the setup on the same spot to use the control point. That might help get the base at least in the correct area first.
Also, SCS900 v3.4 is a pretty old version of SCS900 from more than 4+ years ago. I would strongly encourage you to update to the latest version which is 3.74. This most recent version has had many bug fixes and also a lot of feature enhancements that would likely be useful to you and your field crews. And as a side note, it's likely that if you went through your Sitech dealer to open a support case, the first thing we'd tell you to do is to upgrade to the latest version. . .