And there was me thinking that it was perfectly reasonable to use the GPS as backup for my up to date paper chart and old fashioned navigation technique. And that even if the airspace moves, in my experience a GPS will still tell me where I am, which way I'm going, how fast, and where the airfields are.
Well quite.
It's different of course if you're renting a plane in order to navigate in IMC using GPS ... in which case you make sure you know what you're buying, and you quite probably get what you pay for. And the same fleet may have some of each, which is fine so long as you know which is which when booking.