PDC is a must for NYC. Black bumpers will help too cause I don't think I've seen an unscratched bumper out there. One more thing, you have no idea how many times I've cussed at Queens for their bass-ackwards streets and naming conventions. 41st street is close to 41st road... gotta love it. NAV would be a great option if they have to go places they're unfamiliar with. Real-time traffic info that comes with it too for deciding if they should take the Long Island Distressway at a particular time.