The magority of the carparks I would stop in are multi-storey kind which is a) not the friendliest environment for connecting to objects spinning around in our outer atmosphere at 1000’s of kph in order to pinpoint my location – you could find yourself thinking your in the carpark on the other side of the highway!??; and b) they invevitably cannot tell you accurately your altitude – and if they could, you would still have to convert this to a meaningful ‘floor level’ to actually get back to your car!