The old GPS92, probably easily available 2nd hand, was advertised as being 'worldwide'. What this meant was that it had worldwide airport positions and identifiers. (Not sure about navaids). This was (is) very useful for VFR flying where you are looking out of the window rather than at a moving map inside the cockpit.
The snag was that the (optional) airspace database was for either Europe or Americas. You can swap them in a few minutes with a PC, but they only supplied one.
When I bought mine and discovered that the airspace was Europe only, I complained about the misleading advertising, they sent me the Americas database FOC! Good O'l Garmin!
But even without the airspace, it's a good tool for flying in the right general direction and landing at the right airport. And of course you can put in your own co-ordinates for those elusive grass strips or VFR reporting points.