I guess the Lunar Survey team (named for its position, not for the areas it surveys) will produce fairly accurate moon view maps of most of Genertela.
Issaries maps are likely to be of the quality _sold_ by Joh Mith for the way from Dykene to Gonn Orta's Castle (Griffin Mountain player handouts, p.89). They describe ways, not areas. Treasure Trove Hurby will operate in similar quality, as will the Lunar survey of Rubble locations.
Youcan see what happens if you take this approach and apply it to an area if you look at the Peutinger Table, a Roman route map possibly by 4th century Castorius. It shows Corsica and Sardinia bridging a gulf between parallel shores, and in the north it shows the Rhine flowing off to the west and the Danube flowing off to the east, with a parallel coast on top of that.
The Gloranthan parallel would be the map of the Greater Lunar Empire included in White Bear and Red Moon, which doesn't resemble other maps of Genertela much (among other things, it shows the crater occupying all the territory bwetween Poralistor River - which springs in the Rockwoods - and the Rockwoods themselves, and on the sea coast it has the Deserts of Fear and a West Jungle southwest of the Rockwoods). I should ask for permission to put it up on the web...
Ptolemy's maps were an outstanding achievement. They can't be taken as the staple quality of classical maps, according to R.V. Tooley's "Maps and Map-Makers", which gives quite a few good examples of maps.
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