Aeris computer deco violations

[boat sju]

Got a new Aeris XR-1 and the instructions explain that the computer cannnot calculate deco stops for much greater that 60ft. Just CURIOUS, I have no intentions of coming anywhere near this situation, but how long would you have to be at 130 ft, for example, to require a deco stop at 60 ft? And what would the rest of the dive plan look like?

 

[String]

Depends entire what decompression model youre using.

US Navy tables, standard buhlmann? Gradient factors? VPM ?

In some cases on some models you will never get a stop that deep, in others you will.

 

[boat sju]

So any idea what algorithms Aeris/Oceanic uses?

 

[tedwhiteva]

Got a new Aeris XR-1 and the instructions explain that the computer cannnot calculate deco stops for much greater that 60ft. Just CURIOUS, I have no intentions of coming anywhere near this situation, but how long would you have to be at 130 ft, for example, to require a deco stop at 60 ft? And what would the rest of the dive plan look like?

Depends on the gas mix, but its safe to say longer than you can stay at 130 on an AL80 without being OOA before you get to the surface even without deco.

 

[*Floater*]

Got a new Aeris XR-1 and the instructions explain that the computer cannnot calculate deco stops for much greater that 60ft. Just CURIOUS, I have no intentions of coming anywhere near this situation, but how long would you have to be at 130 ft, for example, to require a deco stop at 60 ft? And what would the rest of the dive plan look like?

The Aeris computers use a modified haldanean algorithm which I believe starts the stops fairly shallow. I'd guess you could stay for hours at 130 ft and the first stop still wouldn't be at 60 ft. You are more likely to get deco at that depth if you dive down to 200 ft or so.

However, some other people (DIR) prefer to starts their stops as deep as about 75% of their bottom depth.

 

[ianr33]

I have an Aeris Atmos Pro and have used it as a backup on a lot of deco dives.You have to try really hard to get it to show a stop deeper than 10 feet. I know that 150 feet for 30 minutes only produces a 20 foot stop on the computer,which is a real good reason to relegate it to backup status

Goodness only know what you would have to do to see a 60 foot stop.400 feet for 20 minutes maybe??

 

[boat sju]

I have an Aeris Atmos Pro and have used it as a backup on a lot of deco dives.You have to try really hard to get it to show a stop deeper than 10 feet. I know that 150 feet for 30 minutes only produces a 20 foot stop on the computer,which is a real good reason to relegate it to backup status

Goodness only know what you would have to do to see a 60 foot stop.400 feet for 20 minutes maybe??

The XR-1 shoud be able to keep me out of trouble though, since me and my trusty AL80 don't venture much past 80 ft very often.

Thanks everyone.

 

[terrasmak]

A short stop at 60 wont hurt at all , even if my computer didnt tell me to stop there i would for at least a minute.

 

[ianr33]

A short stop at 60 wont hurt at all , even if my computer didnt tell me to stop there i would for at least a minute.

Agree absolutely.

The algorithm on the aeris computers is very dated and really not suitable for deco dives.It knows nothing of deep stops.Great recreational computer though,just manually add the deep stops.

Incidentally they are pretty aggressive.I would suggest not surfacing with it in the yellow,extend a safety stop until it goes green unless you have a real good reason to do otherwise.

 

[miesemer]

Got a new Aeris XR-1 and the instructions explain that the computer cannnot calculate deco stops for much greater that 60ft. Just CURIOUS, I have no intentions of coming anywhere near this situation, but how long would you have to be at 130 ft, for example, to require a deco stop at 60 ft? And what would the rest of the dive plan look like?

Using the simulation mode with air on my Aeris Elite (similar algorithm as your XR-1) it took 1hr 55m at 130ft before it requested a stop at 60ft. I think many recreational dive computers try to get you shallow for your deco stops assuming that that they were unplanned and you probably don't have enough gas to complete a deep deco schedule.

As a contrast, running an air dive on Vplanner (deco software) with VPM-B algorithm shows stops starting at 60ft after 20 minutes at 130ft.