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FreeFloat:I would define an accessory as something that although you intend to use it on the dive, if some emergency happens you could face ditching or losing it and still survive.
By that definition, my dive slate and camera are accessories. Yet it's quite neat to have the camera along... especially if you pass it around to your buddy(ies) or other divers from your group. It's amazing the kind of pictures you get back.
diverkid:What the googles is that!
glbirch:It's a small steel hook on a line that you hook on to a dead part of the reef , or rock, or whatever and tie it off to your bc (or hang on to it). Holds you stationary in a strong current without having to fin like a maniac.
Albion:Reef hook, best $10 gadget.