Polyworks

I’m pretty new to Polyworks and have a little query. When establishing a cartesian coordinate system to a primary datum plane and a perpendicular secondary datum cylinder (using a FARO arm), I noticed that the cylinder reports it’s location in X and Y using UAME. It appears to be creating its origin at the point the cylinder axis intersects the primary plane. However, when reporting other features to the datum, it does, as would be expected, use RAME. I just found it a bit confusing as I like to double check my alignment and origin are correct as a bit of a sanity check.