Estimated Preselection

[KBL]

Hi, I have a large project that I have roughly aligned, but I'd like to improve that alignment. I believe the "Estimated" option would be helpful, as it takes into account a previous alignment. When using the estimated alignment option, if I don't reset camera alignment, nothing changes. If I do reset camera alignment, is the previous alignment automatically saved somewhere, or do I need to take extra steps?

Thanks in advance.