I wasn't aware that Vol 3 had any charts in it
and am still none the wiser after reading through Google.
Rod does Vol 3 have charts?, I though it had descriptions of the objects.
I found this critique on the website and thought it is worth posting
http://www.gaherty.ca/rogers/Uranometria.htm
I have the original version and find it quite easy to use once you got the hang of joining the pages together in RA