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I'm looking for reliable quality light that is mountable to my mask strap. Something that won't just fall off and something that I can possible detach and reattach if needed. Any recommendations??

DAN sells these things for $700-$900. Why would I not just get an O2 cylinder elsewhere? Like here? Meret: Oxygen Cylinders, Empty Or here? WP164470 Jumbo Medical Oxygen Cylinder - Grainger Industrial Supply

Hello, I'm frequently in and out of Sudbury and I often dive alone. Are there any divers in that area interested in doing some buddy or group dives? Looking forward to hearing from you!

I understand using the tables and the software. The discrepancy I see is that we are calculating oxygen exposure but not nitrogen exposure. For that we are relying on computers and preconceived data. How do I mathematically manually calculate nitrogen exposure? From all the reading I've done it...

How do you manually track nitrogen when deco is involved and especially when deco using different gases is involved? In no-stop recreational diving you can track nitrogen accumulation by letter groups on the tables. So now if we are going into decompression how do we manually calculate how much...

Instructor doesn't want the tec sidemount course. He just wants the intro sidemount course. Doesn't really make sense to me.

Cavern and intro is correct. Although I posted another thread about the cave certs expiring. My instructor has not written me the intro cert until I complete one more qualifying drill. We squeezed 4 days into 3 days. So of course now I can't officially skip Tec 40. I don't mind taking it, I just...

I live just north of Toronto. My LDS doesn't have many options for instructors and the second closes shop does all their tec courses in mexico which is out of the question for me.

Preferably in sidemount yes. Is this a course I could just take in recreational backmount gear?

I've only done cave 1 and 2. I'm not fully cave certified. I don't live in Florida so I didn't have the time to finish it entirely. I'm now home in Canada wanting to take the Tec courses for deco as you've said.

Pragmatically yes, but I'm speaking in terms of my competence and ability to complete the Tec 40 course without spending another $400 on the beginner sidemount course.

So I've essentially taught myself how to sidemount. I've done some cave training in sidemount as well and my cave instructor had no issues with my diving. He also offered to teach me the Tec courses alongside the cave training. Now I'm back in Canada and I'm looking to take the Tec 40 course...

Do I get a prize for pioneering the longest off topic thread ever?! ;)

Which first aid course do I need to take to satisfy the requirement for rescue diver? There's standard first aid and there's emergency first aid. Do I need to take standard before I take emergency first aid? It's a holiday here in Canada so I figured it'd be faster to hear from you guys, thanks.

I'm looking at getting an AL40 for my first deco bottle. Is there anything in particular I should be looking at in terms of oxygen cleanliness or specific valve types? Or will anything work as long as it's O2 cleaned after purchase? Thanks

It's not the point of having a cavern cert I'm worried about, it's that my travel schedule isn't defined and an expiring certification makes it almost pointless for me to even attempt to complete the full cave. I have many other real life obligations and traveling is secondary.

The organizations he can give a card for are NASE, IANTD and NSS-CDS. Does this all add up?

I recently started a cave course in Florida. I was one drill away from completing level 2 which I plan on returning later to finish. However, he didn't write me a cert for level 1 (cavern) and says that if he writes me any certification it will expire. He seemed to be able to write the expiry...

About a year and a half now. Why?

Well it looks like the SPG gauge is inside a larger metal casing if my eyes aren't lying. How and should I remove this?