Manucubus,
you'll find the answer to your patrol grid renown here
http://www.mysh3.info/shiii/index.php?title=Renown.
Dive depths you'll find in-game by hitting F1 for the help pages.
Just my opinion, although it is shared by quite a few others, on the magnetic pistols is - forget them! I'm going for impact only now, although that might change if I make through a year or two if I see an improvement in them.
And lastly, this is a great place to start for info
http://www.mysh3.info/shiii/index.php?title=Main_Page
If you're new, like me, read this. Anything you don't get in here, search the forum. And if you don't get what you need - post it, people will help you.
Regards, Gavin.