Jim, have a look at your UTM grid reader, and see what scale it's at. Is there a chance it could be at 1:25,000, 1:50,000, or another value like that?
Also, if you add a UTM grid to your map when you are printing it, that can be helpful too.
I have made many, many PDF maps in Caltopo, and the scale always seems to be spot on for me. Good luck!
Since you are actually printing a PDF, you might make sure that when you set the options for the print that you use "Actual Size" and not "Fit". The fit setting always seems to shrink things a little in my experience.
caver456 on 04 Dec, 2017 05:22 PM
Honestly, the transparency grid overall things are very problematic. They
can be a nifty learning tool, but should be abandoned as soon as possible.
Working on the fine art of guesstimation regardless of scale (which
requires a grid on the map) is a universal skill, whereas the transparency
readers only work if all of the possible scaling variables in the print
sequence are working perfectly.