Dive Computer Error

[windapp]

The Padi manual says it, and people repeat over and over that you should not "blindly trust" a computer, and you should use the tables as a sanity check for what your computer is doing. A disagree...somewhat. It is highly unlikely that a computer will simply start computing the algorithm incorrectly. What is a far more likely failure mode is that the pressure transducer will stop functioning correctly. If that happens, and it is your only depth gauge, you can compare to the tables all you want. Since you are using the same incorrect depth that your computer is using, you will come up with the same incorrect result. I think, rather than comparing the computer results to the tables, it is important to compare the computer functions to other sources, like a second depth gauge, dive watch, or your buddy's computer.

 

[dumpsterDiver]

It is good advice to not blindly trust a single computer. If the depth does not match the sonar on the boat, or your knowledge of the area or another computer or it is giving you crazy readings, then you should not trust it. There are a variety of sources of information which a diver might use to perform a sanity check on a computer. Including tables, prior knowledge of what reasonable no-deco limits are etc.

 

[offroadr1]

my dive buddies computer was all out of whack on our last dive. i would bounce from 25ft to 13ft and random depth like that. fortunately 40ft was the deepest we intended to go and she has a depth gauge on her spg console as well.

 

[graham_s]

This is why I have multiple instruments.
I have a depth gauge on my console and a dive timer

 

[supergaijin]

I disagree- I have seen a few different computers and especially the Mares Puck give FUBAR depths and times underwater.

If the computer's depth gauge is innacurate- especially if it reads shallow, you can be in trouble if you dive to the computer's no-deco limits.

Every so often on ebay for example, you come across some hopefuls selling cheap cheap diving computers for a couple of dollars.... because they're being sold for parts as they no longer function properly.

 

[PfcAJ]

I've seen computers give ridiculously short NDL time. The Zoop is a prime offender. Even though the 'algorithm' is working, it produces unrealistically short NDL times. Even on more advanced dives, some will give very different deco times from other computers. Silly.

 

[DevonDiver]

If your computer malfunctions, there's only one (approved/trained) recourse - immediately ascend and end your dive. You don't need gauge redundancy for that.

 

[Texasguy]

Get Oceanic BUD computer. It has 2 algorithms to choose from. This will give you a peace of mind that you have something to compare to and to use it in case your first one will become unreliable all of the sudden.

 

[nimoh]

I think this goes at the main issue with the use of computers, many divers stop thinking.

 

[Insta-Gator]

If your computer malfunctions, there's only one (approved/trained) recourse - immediately ascend and end your dive. You don't need gauge redundancy for that.

I can't agree more with Andy's statement. Too often folks on SB will argue procedures in the case of what appears to be a relatively minor failure of gear. We should all remember, if you have equipment failure, end the dive. Once safely on the surface, try to effect repair or call it a day. Doesn't matter how much the trip cost you, it's not worth your life.