I am trying to georeference a map that has meridians and parallels etc. but no projected grid displayed. I can get the coordinates of the meridians/parallels fine, so georeferencing should not be an issue. HOWEVER the only projection information is "Universal Transverse Mercator" and no zone information is given. The map in question spans western Canada so zones 10N-15N.
It is probably projected in zone 11 or 12 but how to be sure for georeferencing?