Logged Dives .....if you move up in training you might need some required logged dives. I know I did. I use a dive log book with a signature of my dive buddy. I’m also logging dives with my dive computer you can also print that out.........Some activities want you to have current logged dives..... I always log dives (mostly). I know some divers who stopped logging dives over a couple hundred......If you are new to diving log dives that’s the only way you can prove your experience. along with your level of training.