Air Integrated Computers "Could Potentially Kill You."

[Boston Breakwater]

I wonder what the responses would have been like a couple years ago pre Perdix AI.
I haven't been diving that long and my SAC was very bad at first so I wanted to track progress. My 1st computer was a Geo 2.0 which I now use as a backup. I got a good deal on a Vyper Novo and transmitter and wanted to try AI so I bought them. It was nice to track my SAC without having to keep track of tank pressure at the start and end of each dive but now that I have flattened the "learning curve" I have less interest in monitoring my SAC after each dive. I have a little over 200 dives using the Vyper and on 3 or 4 dives I had pairing issues that I realized after splashing, good thing I also use a SPG.
In my opinion if you have money to burn AI is neat but not essential. The more you dive the less neat it becomes.

Very good point.
Thanks.

 

[scubadada]

Has everyone in this thread voted in the poll on diving configuration? How do you dive?

 

[Boston Breakwater]

Has everyone in this thread voted in the poll on diving configuration? How do you dive?

Good morning. I think your input to this thread would have been appropriate, and then the suitable, highly (On Topic.) question "How do you dive?
Thanks for the heads up. Well received.
Cheers.

 

[Angelo Farina]

I discovered that the computer can often indicate a shorter NDL

Please explain?

My assumption was that using deco tables I was always "on the safe side", as I take the maximum depth (even if reached just for one minute) and the total time (from splash in water to the moment I am at 9m, launch the SMB and evaluate how much deco I need).
I made just a few dives (4) using also the Cressi Leonardo computer and going close or beyond NDL. In two of these 4 dives, when I watched the NDL remaining time at the end of the dive, I discovered that it was shorter on the computer than on the tables...
Actually in one of the two dives aforementioned, the table was the classical 30 minutes at 30 meters, which requires a deco stop of 3 minutes at 3 meters. The computer was asking for 10 minutes of deco stop at 3 meters, which I made, albeit I considered it unnecessary.
In the other dive I was within NDL, having spent 40 minutes at 21m, hence the table allows for 10 minutes more staying within NDL. Instead the computer was giving me just 4 minutes of remaining NDL.
Conclusion: it seems that this Cressi Leonardo runs an algorithm on the very conservative side, compared to my old, trusted US navy tables. Indeed I consider it safe to have both computer and tables, and always follow the most conservative indication of the two.
As I considered it safe to have both a valve with the air reserve (or a pony) and also an SPG for controlling the amount of air remaining.

 

[The Chairman]

I dive analog SPGs when on my SF2 and AI when on sidemount.

 

[scubadada]

Hi @Boston Breakwater

The poll was created a little over a year and a half ago. The number of responses has been gratifying, 490, one of SBs most active polls. I created the poll so that respondents could change their vote if their equipment configuration changed. I have changed my vote once. The overall poll results have not changed much over time. The poll was created 5 months after the Teric was released at the end of May, 2018. I find it particularly interesting that 50% of respondents dive an AI computer. The frequency of redundancy is also notable.

Personally, I have been using an AI computer since 2002, a hosed Oceanic Pro Plus 2. I used it for 8 years and then switched to a wrist mounted, Oceanic VT3. I am still diving the VT3, it has 1464 duves/1540 hours on it Shearwater transmitter failure After diving a backup computer running Buhlmann for about 3 years, I purchased a Teric. After about 100 dives, the Teric failed twice and was replaced. The replacement is functioning perfectly Teric owners, have you required repair or replacement service? I have become quite fond of the SurfGF to aid me in my surfacing strategy.

Very best and good diving,

Craig

 

[scubadada]

...Conclusion: it seems that this Cressi Leonardo runs an algorithm on the very conservative side, compared to my old, trusted US navy tables...

The two ends of a very broad spectrum

 

[lowflyer]

Perdix AI with an SPG in my save-a-dive bag

 

[AfterDark]

It always amazes me that the discussions about failure points in scuba are never backed up by any data. In developing maintenance schedules for cars, airplanes and a host of other mechanical equipment they use a methodology called Reliability Centered Maintenance (RCM). Fundamentally the approach tests components of the system to determine the probability of failure and then test the system as a whole to determine probability of failure. Based on an unacceptable probability of failure (time, miles etc) you insert a maintenance (inspection, replacement, service etc). After initial development equipment is monitored for performance in the field to determine if observed failures match predicted failures (it is sometimes different), and maintenance schedules are adjusted.

In SCUBA all of the discussions seem to revolve around some theoretical fear of "failure" and reducing what someone thinks is a "failure point". However, no-one ever has any systematic data to back up their idea. At best they have anecdotal evidence from an incident report or a story. We need to get a lot more systematic about our approach to failure points and reliability.

Who keeps those records?

Risk management is ultimately an individual termination based on facts available, life experience, personal bias, knowledge, of in this case the weakness of digital tech and potential if not recorded failure points in their equipment and how it applies to their type of diving. Then there is the risk benefit trade off. Some divers don't need a computer to calculate how much time they have at depth with the air remaining in their tank. Some divers learned to dive pre-computer / AI for them the risk /benefit is questionable. EDIT As well as the cost.

All of this of course is one diver's opinion.

 

[Diving Dubai]

It always amazes me that the discussions about failure points in scuba are never backed up by any data.

Oh I can. I've been organising monthly weekend dive trips for a group of friends for about 5 years. Over that time we've had approximately 3000 - 4000 man dives

We do keep detailed dive sheets (in case of incident), and I looked back last year for another such thread, and found 12 equipment issues worth recording

Most were O rings popping when turning gas on 1 x hp significant spool leak 1 x LP hose pop. Nothing that couldn't be sorted then and their out of everyone's combined spares.

My point, with gear that is decently maintained, and with the most basic of pre-dive checks and a quick underwater bubble check it really isn't an issue despite what mathematical probability suggests

All the minor annoyances I've had underwater from kit is because I've ignored the issue, promising myself to fix it before the next dive, and "forget". Rinse and repeat

For the record, I dive with AI, transmitter in short hoses, PLUS an spg, because I've never been arsed to remove them, and I like using them when gearing up. Normally hit 150- 200 dives a year, and no issues yet.

I really can't get excited about it all, especially the Shearwater hype nonsense so prevalent on the board. And yes I own one