Deco planner is from the GUE site, Nautilus can be found on the Tech Diving Limited Website
http://tdl.divebiz.net/index.php?mai...ndex&cPath=101
I have deco planner as offered on the GUE site. I used the older version and like the newer one better obviously. I have not yet tried the Nautilus. You will find with any software that you "might" have to modify it a bit to suit you. I know a girl that leans to one model for some dives, and has to lean to another model for other dives because she will feel tired after the dive if she doesn't.