Item	Req. Skill	Needed Materials	Picture
Maps
local map	10.0	1 blank map or scroll
city map	30.0	1 blank map or scroll
sea chart	50.0	1 blank map or scroll
world map	70.0	1 blank map or scroll

Don't waste your money and time trying to get your skill past 99.5 by creating maps as it won't go any higher that way. In order to get your Cartography to GM you will need to either decode maps level 3 or higher till it's GM'd or use a Skillball.