How would you make it so that it can be loaded by the GPS like a real one? Is there a special programming involved in this as in a language, or could you yourself construct in the GPS by entering coordinates etc?
What I suppose I'm asking is: why doesn't someone do this for all airports, sell them and make some money? If EASA or Jeppesen won't play, this is an opportunity for someone else. If I was in a jam and had to choose between a non approved GPS approach into a smaller field IMC or a most likely closed (it's England after all where airfields close at 4pm and you need to fax a PPR two months in advance to be allowed to land) non-responding towered airport miles away, guess what I'd chose?