ChrisA:Why would you take "adv. nitrox"? I thought the only use of O2 over 40% would be for use as a decompression gas. So if you are below a decompression ceiling you don't have access to the surface. Wouldn't you want doubles in that case? If you are using double you will want the backplate.
Just trying to figure out why someone would want to take advanced nitrox class and not want to dive doubles.
Good point... Non-PADI diving is new to me so I'm still learning the ropes
