Thanks for the tutorial! Even if I don't use those programs, I learned a lot here.
Question about sea level; on these graphics it looks like the sealevel is nearly black. Is black the code CAW go for, or is there any known grey code that CAW will use for sea level?
About downloading and risks. I hardly dl anything from sites I don't know. But what I would do, if the site is busy (lots of visits) the chances is that if ppl had bad experiences, the more visits the more negative publicity on web forums and blogs. So, search for the site on blogs and forums. If you find no negative comments, I'd say the chances for trouble are limited.
