Emerson,Thank you for the fine program. I have 2 questions:1.) Is it absolutely essential to have a cpu over 2mhz, or will it run on a 1.3 athlon with 384mb memory?2.) I ran some signal HGT files and also some multiple HGT's and they all came out to .71kb, is this possible?Thanks again for the help,DannyHappy Skies to you!

Emerson, I think I found the answer to both questions. I can run it on my 1.3mhz Athlon, and the small file size ws because I had the LOD set too high, dropped it back to LOD9 and it is OK now.Thanks,Danny