Logged everything (and I mean everything) for the first 350 dives or so. Copious notes, weighting, gas mix, conditions, buddy, thoughts, stuff I saw, etc.
Then I started doing 3 - 6 dives a week and it got too tiresome. I loosely track it on the computer. I "decided" to celebrate 500 last year sometime. I'm quickly closing in on 600. I think.
Who cares? I mean, after several hundred dives? Maybe if you're a journal person, and you're tracking your experiences, then rock on. I just don't have the time to dedicate another 10 - 15 minutes after each dive to write it all down. In a zillion boat dives all over the place (Belize, Hawaii, Florida, Washington, California, Mexico, etc.) I have never one time been asked to produce a log as evidence of experience.
I'm still learning something on every dive. I just don't feel compelled to write it down anymore.
I'd rather throw that time at screening and editing the pics I took on the dive.
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Ken