I've never been asked for a log book at all. Just c-cards.
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tstormwarning:For my Adv. Nitrox course, I had to show that I had at least 10 logged dives at more than 80'. The live aboard wanted to ensure that I have dove within the last 6 mos. Sure, it can be fudged, it is based on the honor system. If it is fudged, most likely, it will show.
If the dive is tech and dangerous I have a team that I would work with. You make it sound like if you have X number of dives in your log book you can then do this dive. Numbers are not experience, are not skill, are not practice, are not training.allenwrench:If the dive is tech and dangerous they usually want to see some history