OP
Sorry for the confusion. Not all of our dives are going to be to exactly 200. There will be several in the 150-170 range. I think you guys answered my questions though.
Trimix 1 Class
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Why should he have described the class "in great detail"? He had a simple question related to the mix being used, not how many times he had to do handstands underwater. A *little* break from the party line would be nice sometimes Mike.
Chick,
Part of the reason here may be the difficulty in finding a fill for anything over 50%. There is one shop I am aware of east of the Cascade Mountains that fills over 40%, and few in the Seattle area that go any higher. We haven't gone home brew yet, but we've started ordering whips.
I also agree with padiscubapro that, if carrying one deco bottle, I would much rather have 50% than 100.
MD
Per IANTD standards all confined water skills must be completed prior to any OW dives. Also no dive can be more than 33 feet deeper than the students deepest. I agree shallow is where you learn new skills. Deep is where you gain experience.
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When we dive a single deco gas we also generally use 50% over 100%. In most cases it will get you out of the water faster.
Obviously one will use more of the 50% than one would of the 100% but if you're doing that much deco you should be using two gasses anyway.
That's the way the circle of folks I dive with do it anyway.
WW
ericfine50
Contributor
So, what do people look for in a mix class? Size, gas choices, location? DIR, non DIR, get the card to get the gas to do the dives correctly?
Thanks
Eric
Thanks
Eric
I have given that alot of thought lately. I have a IANTD Normoxic Trimix card. I own the shop so I sell myself whatever gas I think is best for the dive. I haven't done anything below 200 ft but I use 2 deco gases (and a stage) often and I use mixes with more He and less O2 than what IANTD specifies for normoxic trimix. The only reason I would ever need another card is if I ever want to do a dive and a boat skipper wants the plastic.
If and when I decide to get an "Advanced or Full" Trimix card I have two choices. I can go buy the card over a weekend and pretty cheap at that or I can look for a instructor who could teach me something and take me on some real neat dives. So here is what I think...If I schedule a wreck dive this spring at say 180 and I want to use 18/45 and someone wants to see a card then I'll go buy one. BTW this is a dive I have already done a bunch of times. The depth is within my training (cert) but strictly speaking the mix is not. OTOH, if I have the time, I will go to Florida somewhere just to do a class and dive some real neat caves and/or wrecks and just kick back and enjoy the class.
When it comes to mix I can understand different ratings for different depths but different ratings for different gasses don't make any sense to me.
If and when I decide to get an "Advanced or Full" Trimix card I have two choices. I can go buy the card over a weekend and pretty cheap at that or I can look for a instructor who could teach me something and take me on some real neat dives. So here is what I think...If I schedule a wreck dive this spring at say 180 and I want to use 18/45 and someone wants to see a card then I'll go buy one. BTW this is a dive I have already done a bunch of times. The depth is within my training (cert) but strictly speaking the mix is not. OTOH, if I have the time, I will go to Florida somewhere just to do a class and dive some real neat caves and/or wrecks and just kick back and enjoy the class.
When it comes to mix I can understand different ratings for different depths but different ratings for different gasses don't make any sense to me.
ericfine50
Contributor
Mike,
I agree. I would like to take a Tech 1 or another mix class. I would like to get the best training possible and get the "card" so I can get He and do the deeper and "wennie" dives with the correct gases.
Eric
I agree. I would like to take a Tech 1 or another mix class. I would like to get the best training possible and get the "card" so I can get He and do the deeper and "wennie" dives with the correct gases.
Eric
All you would have to do is call the mix 19/45 and you would be okay. Is that not correct? We had to use 19% or above to meet class specs for IANTD, but I kind of infer from postings here that 18% is still considered a surface mix and would be covered under the term "normoxic".
Although I pretty much agree with you, the benefit I would expect to see with a full trimix class would be more info on stage diving and travel gas usage. Although neither seems to be that tough to figure out, below 200 fsw is not the place to experiment IMO.
MD
Actually the way the IANTD standards read no more than 30% He can be used in the class (don't ask me why). I don't know what someone will actually sell you. Most of my recent cave dives are stage dives. If I need a travel gas I just use my 50%. The leanest mix I have ever used was ok to breath at 7 ft anyway. Too me the issue is depth not mix. There isn't much difference between a 200 and a 230 but a 330 is something else. I'm not getting any yonger and I'm not out to set any records so it may be a nonissue. Our dives are already as much as we can take given the temperature.
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