[paulraymaekers]

Quote: (Originally Posted by beanie)

Split from thread http://www.rebreatherworld.com/rebre...er-lesson.html

Quote: (Originally Posted by am)

I couldn't agree more. It's a similar argument to that of becoming over-reliant on a HUD instead of the basic skill of assessing displays at appropriate intervals.
AnneMarie

hello annemarie, hello all,

can any-one explain me the diff between a display and a HUD, when they both show the PPO2 in a clear way??

paul

[Decodiver]

Hi Paul,

For me the difference is seeing what the PPO2 values are as you breathe. The slight fluctuations that show the cells actually shifting, albeit by small amounts.

HUDs are a great safety feature, but they generally give you a 'Within Setpoint Range' or 'Out of Setpoint Range'.

Even the Smithers code HUDs do not give you the visual information that a glance at a display can provide.

HUDs significantly improve diver safety IMHO, for me they are there to compliment the displays, not the other way around.

Cheers,

Dave.

P.S. Not long to go now!

[Paul Evans]

Sorry don't mean to hijack but why hasn't someone put a small LCD display to show the actual PO2 on a hud? Only the LCD would need to be housed I,d assume electronics to run it inn the head.

Please bear with me I,am new to this and trying to learn

Quote: (Originally Posted by Decodiver)

Hi Paul,

For me the difference is seeing what the PPO2 values are as you breathe. The slight fluctuations that show the cells actually shifting, albeit by small amounts.

HUDs are a great safety feature, but they generally give you a 'Within Setpoint Range' or 'Out of Setpoint Range'.

Even the Smithers code HUDs do not give you the visual information that a glance at a display can provide.

HUDs significantly improve diver safety IMHO, for me they are there to compliment the displays, not the other way around.

Cheers,

Dave.

P.S. Not long to go now!

[Decodiver]

Quote: (Originally Posted by Paul Evans)

Sorry don't mean to hijack but why hasn't someone put a small LCD display to show the actual PO2 on a hud? Only the LCD would need to be housed I,d assume electronics to run it inn the head.

Please bear with me I,am new to this and trying to learn

Because unless it gives you all 3 cell's info, side-by-side, then it gives you nothing that you cannot get from your handset.

If it just gives you your average PPO2 then it brings nothing more than the lights do.

In any case, IMHO, it would just complicate matters on the HUD.

Cheers,

Dave Cooper.

[dave t]

Quote: (Originally Posted by Paul Evans)

Sorry don't mean to hijack but why hasn't someone put a small LCD display to show the actual PO2 on a hud? Only the LCD would need to be housed I,d assume electronics to run it inn the head.

Please bear with me I,am new to this and trying to learn

I think the Prism has a small LCD on the mouthpiece, I seem to remember seeing one at DEMA one year, the problem with this is focusing, its not very comfortable to keep having to focus very close and then return to distance vision, it makes me feel sick after a while!! With an led hud there is no need to focus on it, it is visible in your periphery vision all the time.

Dave

[Paul Evans]

Dave

I realise that it could only show an averge or use voting logic.

I should have made my question a little more clear

so here goes.........

Isn't a display that can actually show the actual value and its real time changes without useing codes, either in colour or flash rate, far more clear and less likely to be mistaken by the diver. Or would this make it far to easy to not look at the handsets and miss something that it would be far better not to miss.

Quote: (Originally Posted by Decodiver)

Because unless it gives you all 3 cell's info, side-by-side, then it gives you nothing that you cannot get from your handset.

If it just gives you your average PPO2 then it brings nothing more than the lights do.

In any case, IMHO, it would just complicate matters on the HUD.

Cheers,

Dave Cooper.

[Decodiver]

Quote: (Originally Posted by Paul Evans)

Isn't a display that can actually show the actual value and its real time changes without useing codes, either in colour or flash rate, far more clear and less likely to be mistaken by the diver.

Yes, but how big are you gonna have to make the HUD for that to happen?

And I cannot see what benefit over the lights, that your average PPO2 would give you by seeing the numbers.

I have an Ouroboros and the HUD for that contains 4 different lights and is pretty big, as I said above, the HUD is there to compliment the handset IMHO, not to replace it.

If you cut any of the 3 cables on the Meg or the Boris, you can still verify your PPO2, that is clever.

Cheers,

Dave Cooper.

[Paul Evans]

Cheers DT and DC.

[Padowan]

Before I got my HUD, there were 2 reasons I looked at my handsets:
1: The times I looked at the handsets quickly to check that the PPO2 was not gonna kill me, and
2: The were times I had a good long look to check that things were operating properly, check cell correlation, watch for fluctuations, determine which cells were voted in etc etc.

My HUD is now telling me all the time what my PPO2 is to the nearest 0.1bar - this only replaces the first reason I used to look at my handsets - I still use the handsets for the second.

On a single loop breather then you could argue that as long as you know your PPO2's not gonna kill you then you're OK, and rely wholely on this display - I'm a bit anal, and I like to know more than that. Mike's experience shows that in some circumstances, that information alone is not sufficient.

As Dave said, a HUD is complementary to a detailed numerical display IMHO, and should not replace good handset monitoring practices - all is does allow you to do is to reduce the required frequency of detailed monitoring.

[Paul Evans]

I realise handset monitering is critical and I,am not trying to find shortcuts.

reason for asking was the accuracy of the reading you get from a HUD, OK let me refrase that, "the ability of the diver to deal with the information under a very stressful situation" In this situation a display of the actual values in numbers seems better than code. Please remember I am only just starting down this path (Half way through MOD1), In time the HUD will probably be as clear to me as seeing the display.........

Does that make sense

Quote: (Originally Posted by Padowan)

Before I got my HUD, there were 2 reasons I looked at my handsets:
1: The times I looked at the handsets quickly to check that the PPO2 was not gonna kill me, and
2: The were times I had a good long look to check that things were operating properly, check cell correlation, watch for fluctuations, determine which cells were voted in etc etc.

My HUD is now telling me all the time what my PPO2 is to the nearest 0.1bar - this only replaces the first reason I used to look at my handsets - I still use the handsets for the second.

On a single loop breather then you could argue that as long as you know your PPO2's not gonna kill you then you're OK, and rely wholely on this display - I'm a bit anal, and I like to know more than that. Mike's experience shows that in some circumstances, that information alone is not sufficient.

As Dave said, a HUD is complementary to a detailed numerical display IMHO, and should not replace good handset monitoring practices - all is does allow you to do is to reduce the required frequency of detailed monitoring.