Ah well, Blunty old bean, when a colleague and I hired a car at Toronto airport, we were offered a Garmin SatNav if we wanted it. So my colleague agreed; when we set off I checked the map date and it was at least a year out of date....
Similarly with an aircraft GPS. If you want to be 100% certain, use your own portable device - which is what I now do when hiring a car in Das Reich as my good old nüvi 660 has up-to-date mapping!