Hi all, I've got a rental at IAD, Emerald Exec level. I've ordered a toll pass which I understand is delivered at the exit gate, but I haven't ordered a navigation device, hoping perhaps the car I pick will have a standard one. If this isn't the case can I order one at the exit booth? Do they keep them in stock? (I'm aware there's a list of cars with included navigation but if there's something special in the aisle I don't want to miss out) Thanks.