Vice.
The language in SA is almost too extreme for me (yeah, and I make sailors go "ok, STFU now please, my ears are bleeding!"), and the map is so damn big I can't remember landmarks worth a damn.
Vice on the other hand I've got mostly memorized (I can see it in the game and have a pretty damn good idea if I need to turn left/right or whatever), and I don't mind the loading screen when playing on a pc (its up maybe a half a second).