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And where did I ever, ever advise that. Fair enough. However, I have never mentiond the number $300 either. Maybe I didn't say it right. I should have said the cost can easily go above $100, which is ususally what I see. Most people in my area dive with steel tanks, LP85 and HP100 are very...

Maybe a bit, but less than $100 is a bit optimistic too. Let's say you use 21/35, which allow you let you go down to ~190 on PPO 1.4. Your back guess is HP100s. That is 70cf of He (~$1/cf), 42cf of O2 ($0.6/cf). Back gas alone is $95. If you add a 50% stage & and 100% deco, you breathing...

You are looking way too far ahead. By the time you really start tech dive, another set of regulators, the cost is low compare to other equipment you need. Just for reference, the gas cost for a tec1 kind of dive is in the hundres of $$. So don't concern too much about the long and expansive...

This I absolutely agree. However, what is the guide line for PADI peak performance buoyance. Can anyone actually fail? with a good instructor and a dedicated student, I am sure good result can be acheived. With GUE, people actually failed fundie and they can't move onto rec3 or tech1 until...

Yes, canister light on left hand, at least by the DIR standard.

Here is a few reason why they are the way they are. Dump value on left side only because tech diver's left hand is for buoyance control. Depth gauge is mounted on right wrist, so that they can monitor depth (especially on ascent) while dumping air. Dump value on he inside has a few...

People SHOULD go into tech class with competent buoyance skill. Tech class should be more about tech diving procedure, situational awareness, contigency planning, .... rather than buoyance control boot camp. It is what GUE fundie and UTD Essential classes are for. Doing a tech dive with sub...

wow, very comprehensive artible. Every diver should at least understand this.

don't rush into buying things you don't even know about. I will 2nd post #2's advice. In fact, I will even suggestion delay buying until you get 25-50 dives. For the first 25 dives, go try different rental stuff. When you dive more, you get to know more divers who is familiar with your local...

at the beginner of the dive, you will be at least over weight by the gas. So to do proper wieght check, purge the tank down to 500psi first. If you are still too heavy, then 1) use AL plate if you are not already using. 2) use light tank. Compare to HP100(-2), try LP85 (0) or AL80 (+4). I...

I think you handled the situation pretty well for having 0-24 dives. What I concerned is your equipments. At 1100psi you called the dive. Assumeing you are at max depth, 29m (say 100ft), you ascent to 50ft for deep stop at 30ft/min rate. That will take ~2 minutes, then 1:30min at deep stop...

That is why I said depends on the instructor. Experiencing a slight narc under close supervision is fine. The key is the one who is supervising need 1) not to be narc, so that 2)aware of student's state at all time. The only way the instructor(s)/DM(s) stay clear of narc is if they are on...

I just moved to a new area. I found a near dive shop do air for $6 and nitrox up to 40% for $10. 12 air fill card is $30, not bad. But they also require o2 clean tank for any nitrox, which sucks. I need to find another shop.

Single for double setup? Is it because of its shape, dump valve location?? I am new to double so can't comment. But for single wing, it seems H is actually at the bottom of these 3. It is entirely the wrong shape to start with (bigger on top, narrower on bottom). The other 2 are opposite...

I was talking to a group of DIR divers on Sunday on a dive site. They all pretty much have H stuff. One of them recommended H wing over others. I have been using Oxy 40lb single wing myself. Honestly, I think its shape is much better than the H Eclipse 40lb. The Oxy is narrower and taco...

Quality & toughness wise, is the H wing more compatible to Oxy extreme series or Vortex series?

Safey stop in PADI's recreational trainin is almost always optional. If you blow it, it isn't too bad. If you push the PADI RDP to a point a stop is necesary, then it is actually a deco stop. A few problems with this so called "in water recompression" for recreation divers: 1) what makes you...

Safey stop in PADI's recreational trainin is almost always optional. If you blow it, it isn't too bad. If you push the PADI RDP to a point a stop is necesary, then it is actually a deco stop. A few problems with this so called "in water recompression" for recreation divers: 1) what makes you...

I have Oceanic VT pro for my single rig. I replace battery everything I see low battery indicator comes on, about once a year, never has computer going out on me during a dive. For transmitter signals, it actually does disappear once in a while for a few second. It always comes back in time...

Not noticing the effect doesn't mean it is not there. How many drunk people know and think they are drunk? Try to do the same 165' dive with proper mix, I bet you will notice the dive site is different.