Discrepancy between my computers during the dive

[BRT]

Thanks, the DAN article does not mention the NOAA exposure table or the half life of O2 elimination vs. cliff vesting after a 24 hour period.

Shearwater and the CNS Oxygen Clock

The question of what CNS oxygen exposure is safe can spark heated debate among technical divers. This reflects the seriousness of CNS oxygen toxicity when diving. This article sidesteps that debate, and focuses solely on how Shearwater dive computers calculate the CNS value.

shearwater.com

That's what I said. There are lots of ways of looking at it. Nobody knows what is correct.

 

[pisauron]

Welp,

Now my Ratio is doing shenanigans again. This time I noticed my deco time on the Ratio was two minute early. Meaning the Ratio said I am clear of deco two minutes before my garmin.

Two minutes is not much and acceptable i guess. But still, what will happen when it's more...

So I checked my logs for the blue hole arch dive - and behold the Ratio deco times are now ~5 min different than Garmin. Damn.

Confucius says: If a man has a watch, he'll always know what time it is. If a man has two watches, he'll never be quite sure

 

[BoltSnap]

Welp,

Now my Ratio is doing shenanigans again. This time I noticed my deco time on the Ratio was two minute early. Meaning the Ratio said I am clear of deco two minutes before my garmin.

Two minutes is not much and acceptable i guess. But still, what will happen when it's more...

So I checked my logs for the blue hole arch dive - and behold the Ratio deco times are now ~5 min different than Garmin. Damn.

Confucius says: If a man has a watch, he'll always know what time it is. If a man has two watches, he'll never be quite sure

Why do you blame Ratio, not Garmin?

 

[J-Vo]

This is completely normal among my Shearwaters, and I know they are all running the same code. Always follow the most conservative one.

 

[pisauron]

Why do you blame Ratio, not Garmin?

Usually because it's inline with the Shearwater divers in my group. But you can never tell.

 

[BoltSnap]

Usually because it's inline with the Shearwater divers in my group. But you can never tell.

I never depend on what other divers' computers say to them, based on my personal experience in the distant past. I'd love to see you using a second Ratio computer to compare the two. Heck, add two more computers, one Ratio and the other Garmin

 

[pisauron]

I never depend on what other divers' computers say to them, based on my personal experience in the distant past. I'd love to see you using a second Ratio computer to compare the two. Heck, add two more computers, one Ratio and the other Garmin

Who says I depend on them?
I dive 1 Garmin 1 Ratio.
The discrepancy is all over the place usually with bad stats for the Ratio. Sometimes it goes into Deco, sometimes wrong ndl, sometime too short deco.

Something's up.
Hard to say what. And the Ratio support is useless.

 

[BoltSnap]

Sometimes it goes into Deco, sometimes wrong ndl, sometime too short deco.

I have re-read the entire thread and find nothing that shows that the Ratio computer is "erring." It merely gives you information different from your Garmin computer.

 

[J-Vo]

Who says I depend on them?
I dive 1 Garmin 1 Ratio.
The discrepancy is all over the place usually with bad stats for the Ratio. Sometimes it goes into Deco, sometimes wrong ndl, sometime too short deco.

Something's up.
Hard to say what. And the Ratio support is useless.

Does the depth reading appear to be stable? My Shearwaters sensors are off by a few MB. Combined with the Nerd being higher in the water column, I've seen them as much as 5 minutes off, but I wouldn't describe it as "all over the place".

 

[pisauron]

I have re-read the entire thread and find nothing that shows that the Ratio computer is "erring." It merely gives you information different from your Garmin computer.

What counts as a discrepancy?