Originally Posted by
SASless
What does the Manual say about User supplied data for inclusion in Updates?
Nothing.
But I do recall contacting the terrain and obstacle database provider (about 5 years ago), and asked how to get the data for the area I was operating in updated because it was woefully inadequate. As I recall, the process had to be directed via the local CAA, and it quickly became apparent to me that nothing was going to happen any time soon. So I didn't bother pursuing it.