Bryan Feir was kind enough to do all the geometric crud and has developed a conversion table explaining how large each grid square is according to its location on the map. On the equator it is straight, and for the size of one grid box it's fairly close. The networld is trying very hard to avoid any specific role-playing system. Two, to avoid copyright porblems. We use English.
Most GMs can read English, or at least have it translated.
Please note that VERY, VERY FEW persons in the networld will have above a Very Good rating in a skill. Even fewer will have more than one skill above that level. Almost NO ONE, except ancient practitioners, or incredibly reknowned persons will have an Exceptional rating in anything. Most of them will be skilled in only one craft. Only roughly one in ten of those will rise higher than a beginner in such fields.