Hi! I'm a diving newbie making my first post. I just started diving this year and an aquaintance provided me his Mares Guardian on loan with the hopes to sell it to me if I like it (for cheap). He has lost the manual. If I had more experience using a computer I might feel more comfortable assuming things about it's operation. Anyone know were I might get a manual? I've wandered aroung the Mares web site with no luck or even an address to e-mail them at. How old is this model? How does it stack up? Thanks for your help! Don't be afraid to insult me with obvious answers as I really don't know much about the sport but am eager to learn!