I have heard the idea of a broken cd to reflect light before but am concerened that even an unbroken one might put a hole in a bcd. This idea of a boat leaving someone behind or not being able to relocate them greatly concerns me as there has been so many stories about such things.

I will post my worst dive later as I need to look at my log book to see exactly which site it was at. I also found my qualifying dives pretty cruelling - particularly as I had bad cramp in the sole of my foot due to badly fitting fins throughout!