When I was in Toby last weekend, I had to show proof of cold water (below 50F) diving experience, my deep speciality cert (I’m trained through Rescue), and proof of a certain number of dives below 80ft in the past 18 months or so, in order to do the Arabia and the Forest City. Simply pulled up MacDive on my iPhone. I have pics of c-cards on my phone (Advanced, Rescue, Nitrox, Deep). Electronic logs really are the way to go. I do keep a notebook if I want to keep dives notes, but I don’t do anything for every dive.