Nitrox course. What's the point?

[Celt]

Sure. In my case, it’s a Shearwater Perdix AI. But there are many others that enable gas switching as well. My previous computer was an Oceanic, and many in the Oceanic line allows this as well. I think you’ll find that many computers offer this capability. The real question is how does the UI enable this. Some are much easier than others. From ease of use the Shearwater UI is worth looking into it, and all their line, even the rec oriented Peregrine offer gas switching.

In the case of the Peregrine, you are limited to 3 different gasses. The Perdix allows up to 5 gases.

Edit. Oh, one more thing. You can absolutely use this function to switch to a higher O2 gas for ascent or deco. Key thing is that the different gasses should be turned off unless they go on the dive with you, to avoid selecting the wrong one. If I only take one gas with me, I leave in simple Nitrox mode which only allows one gas. If I take a pony with me, I’ll turn that one on as well, though likely never switch to it.

Brilliant thank you for your time.

 

[Dody]

It didn't read like a "joke" to me. Rather, it read as a statement.

I love deadpan humor myself (it's a Nordic specialty), but if you choose deadpan, be prepared that people don't get your joke. Or "joke".


You're not the only one, and it's not a phenomenon exclusive to the US.

Are you guys talking about me?

 

[Storker]

Are you guys talking about me?

I'm answering your post, so I'm talking to you.

 

[Celt]

There are a number both in the technical computer market and the top end recreational. (i.e Trimix or Nitrox).

Shearwater
OSTC
Suunto

and others

Even the old version of the Suunto Vytec (2000 era) had gas switching (still miss the one I had).

Shearwater are very popular here on Scubaboard.

I've got an OSTC, bottom end of the market version that doesn't do CCR or Trimix, but will do multiple mixes and on the fly switching. It's a backup to the CCR computer.

Thank you . Not sure if I should post this hear but I can buy a used Heinrich Welkamp OSTC plus for 500 euro used 2018 5 dives done on it in fresh water. What do you think
Apologies to Dody if I’m out of line.

 

[Dody]

I'm answering your post, so I'm talking to you.

You really want to enter into a childish contest about who writes the stupidest things in this forum? Who is more stupid that the one constantly trying to show he got the bigger one?

 

[Divin'Papaw]

FTFY.

I may be out of date, but IME typical rec computers don't allow for switching gas during the dive. One tank (or twinset), one mix is the rule I know of.

You may be right. I'm a self proclaimed Shearwater fanboi and prior to that I used a Dive Rite Nitek Duo which fell into the "light tech" range. The Peregrine supports multiple gases and a gas switch but not helium. But the Peregrine is also in that "light tech" camp and isn't a solely recreational computer. The Perdix and Teric are full-on technical capable computers. I'm not very familiar with other brands. Shearwaters are all that I've used for over 8 years now.

 

[yle]

I hate when I see 33. Meters Vs Feet. Even though it is as simple as to divide or multiply by 3. I know that you guys are the kings of the world but why can’t you use metrics like the rest of the world ?

Funny story that is the answer to that question. The metric system was developed by the French in the 1790's, right in the middle of the French Revolution. (It was actually a project started by Louis XVI shortly before the peasants stormed the Bastille.) Napoleon distributed the new system throughout Europe before he was sent off to his island (for the second time.) And the Europeans distributed it to their colonies in the early 1800's.

The British refused to use the metric system (naturally...) until around 1970, when they finally decided there was no point to being mad at the French any longer.

And the US? The French were a vital ally in the Revolutionary War and remained our most important ally in Europe during the time the metric system was being spread throughout Europe in the early 1800's. So it would have made perfect sense for the US to have adopted it then. And that was the plan... but there was a petty trade dispute between the US and France right about the time Congress was set to vote on the adoption (early 1800's), so they voted against it.

And... that's why we divide by 33 instead of 10. Worth noting that the metric system has gradually sneaked in to common usage in the US, with highway signs in miles and km, packaging in liters and grams (as well as ounces.) Give us another 100 years and the conversion will be complete without anyone realizing it happened.

 

[yle]

dividing by 10 in sea water is easier than 33. what do you do when in fresh water ? is dividing by 10.2 any easier than 34 ?

Yes... actually. Diving by 10.2 is just

divide by 10

then take a 2% discount.

For example...

5639 divided by 10.2

divide by 10

564

2% of this? 2 for every 100? 11

564 - 11 = 553 (this is 5369 divided by 10.2)

Two simple steps when dividing by 10.2

Dividing by 34... not a big deal either, but not as simple as 10.2

5639 divided by 34... probably have to break the 5639 into pieces

(3400 + 1700 + 340 + 170 + 29) / 34

100 + 50 + 10 + 5 + 29/34
or
166

 

[tursiops]

Yes... actually. Diving by 10.2 is just

divide by 10

then take a 2% discount.

For example...

5639 divided by 10.2

divide by 10

564

2% of this? 2 for every 100? 11

564 - 11 = 553 (this is 5369 divided by 10.2)

Two simple steps when dividing by 10.2

Dividing by 34... not a big deal either, but not as simple as 10.2

5639 divided by 34... probably have to break the 5639 into pieces

(3400 + 1700 + 340 + 170 + 29) / 34

100 + 50 + 10 + 5 + 29/34
or
166

LOL. And dividing by 33 is just dividing by 100 (really easy!) and multiplying by 3.

 

[yle]

LOL. And dividing by 33 is just dividing by 100 (really easy!) and multiplying by 3.

Absolutely. The only issue is that too many people have been led to believe that basic math is hard. I point out to my students that they were perfectly capable of doing 3rd grade math... adding, subtracting, multiplying, dividing... when they were in 3rd grade. It was expected of them.

Then sometime between 3rd grade and adulthood, they were convinced that 3rd grade math was too difficult. I let them think about that for a minute, and then I proceed with doing some 3rd grade math (without a calculator!) with them. It's all about expectations.

Personally, I think dividing by any number is equally simple as dividing by any other number.