I'm just guessing. But, this probably locks down the base coord values. So, that dpos does not shift it. I have had trouble with this, and this is my guess.
Nate
Yes, several of us had complained about the shift to CORS when we wanted to process from a know base, but compared to CORS. The new option does exactly what we asked for. Great Job!
I'd like to see that button re-named "Lock coords of known base".
Why?
More descriptive.
So that a field guy won't wonder. Just to reduce tech support.
Nate
Thanks for the replies, and thanks to the developers for implementing this. I've had DPOS shift coordinates before that I didn't want shifted, so that's a nice feature to have.