Seadeuce:But I will be sure to bring my usual DSMB, mirror, EPIRB and DiveAlert with me. Not to mention my compass and a strong voicebox.
What no die marker, flares, cell phone or dive alert?

Just a comment and no offense intended but your strong voicebox comment is rather "interesting" advice...I'd Stick with a good fox40 whistle - it can be heard much much farther than your voice and can even make noise when your voice is shot.