In a rare moment for me, I just read this entire thread before writing, and am ready now to respond. The original question is, when should you have to show your certification card? The correct answer is "when someone you want something from requires it in order to give you what you want." If you want to rent dive gear from a shop, get on a dive boat, rent an air tank or fill one, or whatever, if the person who is facilitating your diving is smart, and safe, and frankly, if they care about our sport at all, they will ask that you show you are qualified to use what is being provided, including a boat ride to dive. Sadly, there are those who do not care, both vendors and consumers. Those are foolish people. Diving is serious fun- and I for one am serious about both having fun and being safe. Unless they are a student under my supervision, I will not dive with un-certified divers. I do not want them to suggest, in they event of a problem happening, that I as a professional should not have let them dive. I do not trust them to know all that should be known before and when diving. I like to dive with competent, safe divers, who know the basics and theory of diving and proper procedures to follow. I say this as a diver first, a dive professional second, and as a lawyer third ( yes, I confess, I am a trial lawyer, have been for 33 years). Let's each step up and care about our own safety and the safety of those with whom we dive. Please. This discussion went off in the wrong direction- sort of "what can you get away with outside basic standards and safety and training." That is not the point. The point is if you love scuba, or think you might, get trained properly, be active and keep your skills (and equipment) tuned to excellence, and the you can really enjoy diving! Be PROUD to show your C-card. You're a diver!
DivemasterDennis scubasnobs.com