All things being equal, I would rather be at 1.3 than 1.4 and I ain't watching NDLs that closely anyway so the difference is marginal...o2 scares me more than n2..
You're diving Nitrox: Do you choose best mix or standard mix
- Thread starter King Kong Matt
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
OP
King Kong Matt
Contributor
This has been interesting so far.
Basically, the same kinds of opinions I see when talking to people are what I've seen on the board thus far. There seems to be a 50/50 split between practices.
Interesting...hope more people chime in on this one.
Basically, the same kinds of opinions I see when talking to people are what I've seen on the board thus far. There seems to be a 50/50 split between practices.
Interesting...hope more people chime in on this one.
Depends on the dive.
If it is a planned expo type of deal all my gas is planned out, sets of doubles are filled in advance, as are deco and stage bottles.
If im going to dutch or an inshore wreck, ill use whatever i have in my tanks. Usually 29-34% and plan my dive according to the mix I have (usually leftovers, or half full tanks.) After all feeding the fish at dutch in 15 ffw doesent require a tech approach......
Id rather use whats available then spend more money on dumping my tanks and refilling or just adding o2.
-gjm
If it is a planned expo type of deal all my gas is planned out, sets of doubles are filled in advance, as are deco and stage bottles.
If im going to dutch or an inshore wreck, ill use whatever i have in my tanks. Usually 29-34% and plan my dive according to the mix I have (usually leftovers, or half full tanks.) After all feeding the fish at dutch in 15 ffw doesent require a tech approach......
Id rather use whats available then spend more money on dumping my tanks and refilling or just adding o2.
-gjm
pchelp
Guest
Probably not what most do. Most of my diving is in the gulf, ranging from 40'-100', will usually take 1 (HP120) at 32%, and one LP108 at 38-39% for a shallow dive, most of the time I can get an air fill (21%) to top off the LP tank later and have a tank of 30%-32%, for a deeper dive in the future. Most of the diving is multi-dive same day, so I'm more worried about N2 than O2, since the next day won't be diving.
In the class this weekend I took with Ziggys_Friend I argued hard with MHK about choosing best mix. MHK laid some really solid groundwork and arguments for standardizing the mix.
He proved to all of us that we personally could calculate our current NDL almost instantly in our head every 5 minutes throughout a changing depth (multi-level) dive with no complex formulas and no computer assistance, no tables to memorize. He also showed us quickly how to refill a standard mix in a tank with any amount of left over gas. I have to agree now that I've seen it work for myself and proven the simplicity when it comes to mid-dive contingency or emergency planning.
We are after all creatures of habit and as Ziggys_Friend says it's "not worth the hassle and possible confusion factor". I'd give you the quick neumonics we were given but then I'd be giving away some of the best stuff about the DIR-F class. I recommend everyone take it to help them "set the bar" as MHK puts it.
He proved to all of us that we personally could calculate our current NDL almost instantly in our head every 5 minutes throughout a changing depth (multi-level) dive with no complex formulas and no computer assistance, no tables to memorize. He also showed us quickly how to refill a standard mix in a tank with any amount of left over gas. I have to agree now that I've seen it work for myself and proven the simplicity when it comes to mid-dive contingency or emergency planning.
We are after all creatures of habit and as Ziggys_Friend says it's "not worth the hassle and possible confusion factor". I'd give you the quick neumonics we were given but then I'd be giving away some of the best stuff about the DIR-F class. I recommend everyone take it to help them "set the bar" as MHK puts it.
I don't suppose you would share this, would you? This wasn't in my DIRF..
raxafarian
Contributor
I think I've seen you say that several times now
GearHead
Contributor
Which instructor(s) did your Fundamentals class, Eric? It sounds like you got the shaft on the profiling part. I haven't taken DIR-F yet, but it sounds like this was covered in most of their classes. And you can bet I'll be grilling them on deco theory when I do mine later this year.
.
Similar threads
