Pat, Thanks for that.
Actually what I was refering to was the download on this site.
http://www.shrapnelgames.com/prosim/atf/6.htm
It is just called "Digital Elevation Model Converter" and it has little, actually no docs.
As for generating maps, that is somewhere up on the learning curve for me. I am arguing with the game at present. I keep comming across new approaches to doing things and its is at least enjoyable but frustrating.