SCUBA Junkie

I, for one, have not found my level of "oxygen sensitivity" as of yet. This may be because I tend to dive very conservative profiles, and rarely breath over a 32% mix. I also tend to limit myself to no more than 2 dives per 24 hour period, and try not to get into any reverse profiles.

On the same note, I have yet to find my nitrogen sensitivity limit, as I have never been "narked" to my knowledge.

Turtlebait

The BEAUTY of being NARCED, is you DON'T know you're NARCED, until someone ELSE tells you how GOOFY:letsdrink you were acting! - Ric

Telum Pisces

If you do not know that you are narced then you are way beyond where you need to be. Kind of like the whole drinking thing. I know when I am drunk/buzzed. You can feel it coming on. I have felt being narced a few times. I have always felt it and new I was narced. I don't get goofy when I get narced. I get more aware that something is not right and that I need to concentrate on correcting the situation. I usually know I am narced when I turn my head and my head starts spinning. Kind of like that feeling you get when you're drunk and you close your eyes. I know that's my cue to accend a bit.

cmufieldhockey8

I recently discovered that I got this very "deep" feeling of nausea whenever I deco'd on o2, even on different o2 bottles. It got better on air breaks and completely away after I got off the o2 for a few minutes. I felt it at 13 ft.



A few weekends ago I did something stupid and did a dive that was a lot more work then I anticipated on a mix that made a po2 of 1.2. That very same nausea came back although not quite as intense. To give you an idea how hard I was working, I swam my butt off 34 minutes against the flow, then turned around and drifted back in 14 minutes not kicking once. I knew better but for whatever reason I did the dive so now I know if I'm working pretty hard, 1.2 is too much. Sounds kind of ridiculous but its a very distinct feeling.



100% o2 at 13 ft is 1.4 and I got the nausea at complete REST on the 02. I was taught to decrease the po2 by .2 when planning a working dive so it seems completely reasonable that I could get the nausea at 1.2 on a working dive.



My point of bringing it up was to remind us all not to assume that we're good on a working dive at 1.6 even though we are taught that we SHOULD be ok at 1.6. Heck I'm not even good to go at 1.2. Let's say I am doing a nice easy dive at 1.6 and maybe my stomach feels a little funny but I think it may be from those tacos I had for lunch or the rough ride out to the dive site. If something bad happens and I've all of a sudden got to work REALLY hard to save my life I my ox tox problems may certainly increase. However in this case I don't have the option of halting my dive, grabbing onto a rock and resting till I slow my breathing and get rid of some co2 because this situation that is making me work hard is life threatening. I'm screwed.

scubageek

Love Nitrox, am a huge proponent for getting Nitrox certified. As with Air or any type of mix you use plan your dive and dive your plan.

I take into account how deep I might possibly go too for an optimal but safe mix....



I used to dive with my computer on air a lot but it depends where I am diving and what my mix is too.



If I dive the "O" I try to keep it real and dive with my computer on my mix due to the depth of the wreck vs the bottom depth.



Jim we seem to hit a lot of 30 and 32 mixes and some 28's too but you guys are doing a lot more "O" divers than we do in a year...