I'd like to nominate myself for the "Dumbest Newbie" award. 10 minutes into a recent boat dive, I thought I'd check my SPG and was amazed to find it wasn't where I normally clip it, or floating behind me. Then I realised I was feeling a hard line down my back, under my BC. I'd managed to put my gear on with the SPG/computer between my back and my BCD. I was able to work it around just enough to see it, and probably used a fair bit of air in the process. All I can say is, I won't make that mistake again (and if I do I don't deserve to dive).