Incident due to battery change on dive computer

[boulderjohn]

For me, the point is that the tables would have helped him decide to NOT do the second dive.

Which is what the computer tried to tell him.

I am still trying to figure out how having a thorough knowledge of the tables would have made him better able to follow the guidance of his computer.

I am still trying to figure out how knowing how to do tables for the second dive would have helped, since the tables would have told him the same thing as the computer: don't do the second dive.

In summary, I don't think it matters whether you ignore the computer or the tables. As the old rock group Faces told us decades ago, a wink is as good as a nod to a blind horse.

 

[Wookie]

None of the Suunto's I've owned do this. I last dove my Vytec in Truk three weeks ago. I just turned it on now and it's still set for 28%.

Sorry, it was a NiTek. I got rid of it. my bad. Mistake. Sorry. Mea Culpa.

 

[Redshift]

Yep, it can. At least for Oceanic. From the Oceanic Veo Owners Manual.

View attachment 206414

OK, it's not really 50 and 79, it's 50/50 for one calculation and 21/79 for another. That makes more sense.

 

[redacted]

OK, it's not really 50 and 79, it's 50/50 for one calculation and 21/79 for another. That makes more sense.

My older Oceanics default to 79% N2 for N2 loading calculations and 50% O2 for O2 loading calculations. So, If I change mix and don't reset it, it will always error on the safe side. You may forget to reset once, but not very often thereafter. N2 loading calculations are not a function of FO2 and O2 loading calculations are not a function of FN2.

 

[KeithG]

For me, the point is that the tables would have helped him decide to NOT do the second dive.

I disagree. He had a computer that told him not to do the second dive. It was ignored. I assume he would also have ignored any information his tables, depth gauge or bottom timer provided. Unfortunately this is NOT a computer versus tables situation. This is a situation where a diver ignored his instrumentation and his ....

Question: Did he have common sense and/or training that he also ignored?

A very scary side note is that the second diver also seemed to have ignored his computer since when checked on the second dive it was in "up" mode. WTF? How did that happen?

I find it very sad that Wookie can report a significant (large? I don't remember his exact words) portion of divers who do not know how to "read" their computers. I would have blindly assumed that 1 in 20 divers did not "understand" and 1 in 50 could not "read". I must be naive? Aren't people smarter than that when it comes to their personal safety?

Maybe the subject of "reading" and "understanding" computers is worth a separate thread?

 

[KenGordon]

Was she from the UK by any chance?

Why do you say that?

More likely somebody who believes what they read on SB:

https://www.google.com/?gfe_rd=cr&e...q=suunto+conservative+site:www.scubaboard.com

 

[Wookie]

Why do you say that?

More likely somebody who believes what they read on SB:

https://www.google.com/?gfe_rd=cr&e...q=suunto+conservative+site:www.scubaboard.com

I say it because I had a female dive instructor on my boat this spring from the UK who fought me over this exact issue. She was furious that I sat her out 24 hours.

Why would you be defensive about that?

---------- Post added April 12th, 2015 at 06:15 PM ----------

I disagree. He had a computer that told him not to do the second dive. It was ignored. I assume he would also have ignored any information his tables, depth gauge or bottom timer provided. Unfortunately this is NOT a computer versus tables situation. This is a situation where a diver ignored his instrumentation and his ....

Question: Did he have common sense and/or training that he also ignored?

A very scary side note is that the second diver also seemed to have ignored his computer since when checked on the second dive it was in "up" mode. WTF? How did that happen?

I find it very sad that Wookie can report a significant (large? I don't remember his exact words) portion of divers who do not know how to "read" their computers. I would have blindly assumed that 1 in 20 divers did not "understand" and 1 in 50 could not "read". I must be naive? Aren't people smarter than that when it comes to their personal safety?

Maybe the subject of "reading" and "understanding" computers is worth a separate thread?

I said significant percentage, because to me, any is a significant percentage. We carry 24, maybe 2-5 per trip? And what I said was "could not read", that is, they cant get it out of surface mode into log mode, nor can they seem to remember "depth" for "time" for the minute it takes to climb the ladder.

 

[KenGordon]

I say it because I had a female dive instructor on my boat this spring from the UK who fought me over this exact issue. She was furious that I sat her out 24 hours.

Why would you be defensive about that?

---------- Post added April 12th, 2015 at 06:15 PM ----------



I said significant percentage, because to me, any is a significant percentage. We carry 24, maybe 2-5 per trip? And what I said was "could not read", that is, they cant get it out of surface mode into log mode, nor can they seem to remember "depth" for "time" for the minute it takes to climb the ladder.

It seemed an odd point to be making. More strange still since this is the home of the "Suunto computers are too conservative" orthodoxy. At least nobody has suggested his mistake was not to have bought a petrel which would not have locked him out.

Back to the topic - how about the underlying issue is that to divide diving into within NDL rec and over NDL tech is bogus. Diving involves decompression and if you can't understand it then don't go diving.

 

[AfterDark]

I disagree. He had a computer that told him not to do the second dive. It was ignored. I assume he would also have ignored any information his tables, depth gauge or bottom timer provided. Unfortunately this is NOT a computer versus tables situation. This is a situation where a diver ignored his instrumentation and his ....

I think the OP thought he was getting bogus info from his PDC because of the setting it was in. Maybe and that may be a BIG maybe if he planned the second dive with tables he would have realized that his PDC was right? Maybe not?

 

[Wookie]

It seemed an odd point to be making. More strange still since this is the home of the "Suunto computers are too conservative" orthodoxy. At least nobody has suggested his mistake was not to have bought a petrel which would not have locked him out.

Back to the topic - how about the underlying issue is that to divide diving into within NDL rec and over NDL tech is bogus. Diving involves decompression and if you can't understand it then don't go diving.

I don't think Suuntos are too conservative, but I think that they are very conservative, but then, I dive my shearwater at the most conservative setting too. I tend to get bent...