And if you know both that you're map-illiterate and you're going someplace you've never been before, give yourself some extra time. Better you have to cool your heels for a while than have clients wondering where the hell you are! (Not to mention the fact that you really don't know what the parking situation is in a given Chicago neighbourhood until you've been there--but, then again, this is one thing I suspect parking-spoiled suburbanites never think of.)