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If you phrase the question as "Can I use EAN36 on the first dive, and EAN21 on the second dive without running into safety issues", the answer becomes obvious.

There aren't enough options in the poll. I use tables for a quick reference when I need it, or if I am somewhere without a computer. There are times when it is a lot quicker to use the tables for planning than it is to use the computer. However, for most dives, I pretty much know the rough...

I think it best not to calculate the actual pressure groups prior to your dive computer failing. That way if it fails, there is no way to know for sure if the rest of your dive day is done, and you can bask in blissful ignorance until you do the actual calculations;)

Whatever your regulator choice, they need to be serviced, so be sure that whoever will be performing the service is willing and able to service all of the regulators on the set. I have a US divers Octo, a Scubapro First stage, a Scubapro primary second stage, I don't remember the brand of my...

I think this is more of a free diving question, rather than a scuba question. There are thoughts that excessive hyperventilation prior to a free dive could lower your CO2 sufficiently that you could black out do to oxygen starvation before your body delivers that super urgent need to breath...

I wouldn't like any. If I need a c card, it ends up costing more in the end. If I don't need a c card, and there is no practical training involved, I can always read a book.

I do no decompression diving and I own recreational no decompression computer. My computer can calculate stops in an emergency but I never exceed the ndl so they are irrelevant. Anybody who does actual trained decompression diving knows exactly what decompression algorithm he/she is using...

I don't really see the difference between a tuned down adjustable air balanced second stage and a very simple non-adjustable second stage that is tuned just right to be an octo except for the price. I use a G250 for my primary and a US divers Conshelf 21 for my Octo. I chose the G250 because...

I have never really understood this. If my octo was the same as my primary, it would free-flow every time a jumped into the water until I shook the air out of it.

I would not spend any more than $250 on your first BCD. If you don't like it, $600 is a lot to blow. Just get a used BC, and after you have figured out what your trim requirements are, then buy your permanent one. Your BCD is a very personal thing. You can get 100 different opinions on a...

But what other insurance is going to cover you for getting a bad cold? Dive accident insurance is really a supplement to existing insurance.

I put them both on the right.

I would recommend going with a 3 mm full rather than a shorty. Half length exposure protection has a tendency to throw off trim. You will probably want to buy a lighter back plate, or even a soft back plate. There is no way you are going to need 20 lbs. I weigh about as much as you, and I...

If you want something quick/cheap, you can run a couple of pieces of surgical tubing through the existing mount where the strap normally goes. it works for me.

Some of the biggest dangers to new divers: Doing something wrong just because you see everybody else doing it wrong. Doing a dive that you know is well beyond your previous experience. Taking on too many tasks before you are comfortable with the tasks you already have. This includes bringing a...

60°F is not cold water diving. You don't require gloves or anything thicker than a 5mm wetsuit. Some don't even wear a hood. The reason why I say that it is not cold water diving is because it doesn't have any of the characteristics of true cold water diving, the biggest of which is the...

Another "Why do I have to be certified" post. You have to take the course to gain the certification in order to get Nitrox fills. Why can't somebody give me Nitrox fills without the course? Because if you die making a mistake, your family would sue the person who sold you the fill in a court...

It is important that we explain these things with accuracy so as to avoid propagation of inaccuracies. When one of us mis-speaks, I think that we should be corrected so as to avoid confusion.

If you have different computers, you just follow the most conservative. As new divers, you won't approach your ndl anyway. Whether you use the same or different computers, you can still compare depth readings which is the only thing that can fail without notice anyway.

I am pretty sure that you don't have to worry about "[taking] deep breaths" if you are doing an emergency buoyant ascent. The last I checked this really isn't possible when you are out of air.