Nice, I thought about sticking one of the Base Station (?) thingy's on the roof of my house.
Of course you are right, not to use this data for real flight planning or whatever, but the thing is that people are encoding this data every day for "official" products, and it wouldn't be hard to create a 3D GPS display. It is interesting to download your GPS track into the Google Earth after a flight just for the hell of it.....
In fact, I think it is VistaNav you can get in the USA, (which also has a gyro input) which is a purely synthetic 3D view, with terrain and airspace encoded which looks pretty cool. It is the way things are going, thats for sure.