What gear do you have for this dive. You have a current CPR cert? Cool. Do you know the changes they made to the CPR procedures lately? Cool... Rescue? Yep I got yours and my back. AI? Wow, that is even better. Talk to your buddy and know how current their certs are and what their experiences are. I have always let my buddy know my experience. I was Certified by the Y in 84, joined the Navy in 86 and started diving their way, got my AI in 98. There, now you all know some about my certs.