The red logbooks are pretty useful if a bit old school. It makes sense to keep a log of your dives, after twenty years and hundreds of dives I still write stuff up in my logbook. [/QUOTE]
I massively regret not logging my dives after about 150 - I thought it was a bit spoddy to be honest - but a few years later a mate got to some significant big number (4000 dives or something) and I realised I had no idea how many I had done so I started logging them again but couldn't reconstruct the "lost" dives. So even now I have 700 and something logged dives plus several hundred from the "gap" so I have probably passed 1000 but will never know.