Why have an in-game map if no one knows how to make one? It's been suggested by myself, and a couple others now to make a "cartography" skill later on in the development of game, to allow the player to "make maps." Better maps, with increased size and detail could be made as the skill got higher. Then the maps could be traded in game, and who knows, maybe by "reading" hte map it would fill in some sot of player map generator deal, similar to in game maps of other games, but you'd have to "buy" it in sections and wouldn't have the map in an area till you bought it. Now that's something I'd like to see.

Maps aren't sandbox, now player generated and tradable maps, that's sandbox.