Best First Dive Comp under $700?

[scubadada]

I also have VT3. It is quite accurate for yourself. But what if you need to share air near ATR close to zero. All the ATR calculation is based on the previous 60s or so while you are calm. Now, you have 2 divers, both are probably under stress. The reserve you set in VT3 may or may not get you both to surface with a safe ascent profile.

I have had to share air during my safety stop. It turned out fine because we are already at 15ft. But I can definitely imagine if I have to start sharing deeper.

If you don't use ATR, good for you. I hope all AI users realize what the AI is doing and take extra pre-caution

I almost always dive solo, and, of course, I also have my pony. I do things differently when I'm diving with a buddy.

Keep in mind that Oceanic's ATR=0 means that if you make a normal ascent with a safety stop (or decompression stops, if needed) you will surface with the gas pressure you designated in the setup (mine is set for 500 psi). Not infrequently, on my usual relatively shallow drift dive, I start my ascent after my computer has hit ATR=0, as I don't intend on surfacing with 500 psi.

I'm not sure that all AI computers use the same convention for ATR, one needs to know their own computer. I had a Pro Plus and a Pro Plus 2 prior to my VT3 and understand Oceanic AI computers well after diving them for 15 years.

Good diving, Craig

 

[eelnoraa]

...
Keep in mind that Oceanic's ATR=0 means that if you make a normal ascent with a safety stop (or decompression stops, if needed) you will surface with the gas pressure you designated in the setup (mine is set for 500 psi). Not infrequently, on my usual relatively shallow drift dive, I start my ascent after my computer has hit ATR=0, as I don't intend on surfacing with 500 psi.

Like I said, I am also a VT3 owner, I know exactly how the ATR in Oceanic/AUP computers behave. What I can agree is that if you are solo or if you have additional gas supply outside of AI computer estimation, then this doesn't apply. But this does show the limitation of AI.

If you think about it, at ATR=0, you start ascent and you will reach surface with 500psi. This means two thing: 1)the 500psi reserve is what is available for you buddy if at ATR=0, you need to share air. 2)ATR is based on your average consumption for the previous 60second or so interval, which you may be calm and enjoying your dive. It does NOT reflect the consumption if things happen.

Assume yours and your buddy's consumption don't increase at all in emergency, the 500psi may not be enough for your buddy depending on the depth you are at, at ATR=0. Add the increase in stress increases consumption, I would say even if you don't need to share air, the "additional" 500psi reserve may not be enough for yourself depending on the depth.

The design flows in ATR algorithm (at least for AUP computers) are 1) it assumes one diver is breathing. 2)it estimates consumption based on what happen before, then use that estimation to apply to what will happen in the future.

 

[scubadada]

Like I said, I am also a VT3 owner, I know exactly how the ATR in Oceanic/AUP computers behave. What I can agree is that if you are solo or if you have additional gas supply outside of AI computer estimation, then this doesn't apply. But this does show the limitation of AI.

If you think about it, at ATR=0, you start ascent and you will reach surface with 500psi. This means two thing: 1)the 500psi reserve is what is available for you buddy if at ATR=0, you need to share air. 2)ATR is based on your average consumption for the previous 60second or so interval, which you may be calm and enjoying your dive. It does NOT reflect the consumption if things happen.

Assume yours and your buddy's consumption don't increase at all in emergency, the 500psi may not be enough for your buddy depending on the depth you are at, at ATR=0. Add the increase in stress increases consumption, I would say even if you don't need to share air, the "additional" 500psi reserve may not be enough for yourself depending on the depth.

The design flows in ATR algorithm (at least for AUP computers) are 1) it assumes one diver is breathing. 2)it estimates consumption based on what happen before, then use that estimation to apply to what will happen in the future.

The ATR is but a single piece of information available if you use an AI computer. Understand what it means and use it for what it's worth.

You seem very stuck on you own path of thinking and not very flexible. Best of diving to you

 

[abstract]

What would be the best wrist OLED computer with air integration for recreational diving?

 

[buddhasummer]

What would be the best wrist OLED computer with air integration for recreational diving?

I'm not sure one currently exists. All I've seen seem to have one issue or another. I am interested as to what people might recommend though.

 

[tbone1004]

I'm pretty sure you have to pay up for the Eon Steel or Liquivision Lynx, but those are minimum $1400.... The issue right now is with the Petrel so cheap, you have to say that AI alone is worth that price premium, which is $650 for the Lynx, or $1100 for the Eon Steel. Options are Petrel + Hog D3 sidemount set, or Petrel + Hog D3 sidemount set + BP/W or sidemount rig of your choice, OR the Lynx or Eon Steel....

 

[buddhasummer]

**** the Eon is spendy. Has Liquivision sorted the battery issu/s out? Has their seemingly sketchy customer service improved? The Aeris looked like a nice unit but it seems to be plagued with issues.

 

[tbone1004]

yes, no idea due to not caring, and Aeris yeah but it's basically discontinued.

Oh, add Oceanic VTX for $1300 to the list...

 

[ronscuba]

I'm pretty sure you have to pay up for the Eon Steel or Liquivision Lynx, but those are minimum $1400.... The issue right now is with the Petrel so cheap, you have to say that AI alone is worth that price premium, which is $650 for the Lynx, or $1100 for the Eon Steel. Options are Petrel + Hog D3 sidemount set, or Petrel + Hog D3 sidemount set + BP/W or sidemount rig of your choice, OR the Lynx or Eon Steel....

How does sidemount or BP/W enter into the options ?

 

[victorzamora]

The ATR is but a single piece of information available if you use an AI computer. Understand what it means and use it for what it's worth.

Craig, earlier it was being posted that a rec-only AI computer (Sherwood Wisdom 3, similar to VT3 but not hoseless) was the only logical choice for a new diver because new divers were too stupid to read their SPGs. Now you're saying computer-managed ATR is only for people that understand the ATR algorithm, dive solo, and with a pony bottle. I agree with you that solo with a large-enough pony would add enough conservatism to make ATR less atrocious. If an AI computer were to run RockBottom/MinGas then it'd be better in my eyes...but would piss off people like you diving solo with a pony because it'd be inaccurate. MinGas/RockBottom is about cubic footage to get both divers (you and yourself if diving solo) to the surface with twice your consumption rate. That would also piss off the newbie divers that didn't know why it was being conservative, so nobody wins.

---------- Post added June 15th, 2015 at 09:07 AM ----------

How does sidemount or BP/W enter into the options ?

For the price of an OLED AI rec-only computer, you could get a Petrel and a BPW and a full reg set. When you think about it like that, the price really seems to get crazy. You can almost get two Petrels for the price of a rec-only AI OLED (or lit-pixel type LED LCD)....and most of the rec-only AI competitors have some pretty awful reviews around them.