Bonus Refinement
 

I've modified these topics by adding in a "Bonus Refinement" subtopic with the info suggested:

In GD&T FCF section: http://10.57.112.13/WAIhelp/Core/fe...ning_Datums.htm

In Legacy Dimension section:
http://10.57.112.13/WAIhelp/Core/19...sing_Datums.htm

Let me know if anything else is needed.