Hi Mary
Thanks for the update.
I had taken your previous example (mappoints.ncl) and hacked together solutions to label the radial circles, and to rescale the radius values to units of latitude. The former was quite easy, I just borrowed from http://www.ncl.ucar.edu/Applications/Scripts/lcmask_4.ncl. The latter was a little more convoluted because gsn_polar_map has 90N at the origin, so I had to reverse everything so that 0N was the origin.
My code is attached, along with the output. I used text labels instead of markers, but the idea is the same.
Hopefully it makes sense and could be of some use.
Chris
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