deco myths

[Blackcrusader]

I understand there are limitations in recreational diving that tech divers are not subject to

That would be depth then? Use of CCR? Planned Deco ( some of the divers here may do an unplanned deco dive if they have sufficient gas for a single tank ) dives at depths shallower than 40m depth are also recreational dives.

 

[LI-er]

Like go have a conversation with a recreational diver who sets their computer to 90/90

I'm not ashamed to admit I have no clue what setting a computer to 90/90 actually means.

 

[Blackcrusader]

I'm not ashamed to admit I have no clue what setting a computer to 90/90 actually means.

There is no shame in not knowing. A friend of mine who has TDI ANDP and Padi instructor bought a Perdix after diving with me. I have had to show him some settings and get him to read about GF functions and settings.

Well my low is GF45 ( for deco dives ) and GF 95 for NDL dives. If you have a DSAT table take that as 100%
GF95 is then 5% more conservative than the table. GF85 is 15% more conservative so your NDL time at depth is less.
It is a way for default settings to be conservative so divers are not pushing the limits on NDL dives.

For Deco dives that requires other training.

 

[LI-er]

I dive an older Oceanic. There are settings for PO2 limits, and alarms for whatever range of N absorption you may care to specify, but no GF functions.

 

[LI-er]

Are we not saying the same thing?

I guess we were. I was trying to wrap my head around exactly what you were trying to say (I thought you were skeptical of the video guy's chosen words rather than being in agreement) but failed miserably.

 

[Blackcrusader]

I dive an older Oceanic. There are settings for PO2 limits, and alarms for whatever range of N absorption you may care to specify, but no GF functions.

Yup my dive buddy had two. They both played up on our dives in Bali last year. We've been diving together for several years now and also on night dives he really likes how easy the Perdix is to see. So we make sure we have the same settings on our dives together. Sometimes our guides need to stay shallower as they often use Sunnto with quite conservative settings.

 

[EFX]

Mark Powell states that all dives are decompression dives in that the tissues offgass or decompress on ascent. My wife who is not a diver understands this concept. After a late night dinner of pepperoni pizza with extra cheese when we're in bed she complains. I tell her, "Honey, relax. I'm just offgassing. You don't want me to get bent do you?"

 

[Cthippo]

Mark Powell states that all dives are decompression dives in that the tissues offgass or decompress on ascent. My wife who is not a diver understands this concept. After a late night dinner of pepperoni pizza with extra cheese when we're in bed she complains. I tell her, "Honey, relax. I'm just offgassing. You don't want me to get bent do you?"

I have been literally bent over in pain from offgassing after eating the wrong things more than once in life. It's not fun. Maybe they should point that experience out in OW classes as to why NOT to ride the NDL

 

[LI-er]

Did I eat only 9 chicken wings last night or did I eat 10?

It could mean the difference between life and death.

 

[Wibble]

I understand there are limitations in recreational diving that tech divers are not subject to including what you posted and of course the ability to dive deeper reefs and wrecks. I'm just saying to me, the additional time spent on a hang, and the time, expense and additional gear is simply not worth the trouble.

Then you are excluding yourself from deeper dives or spending time on the wreck or other feature. Shallow short dives are pointless to many of us. Deeper dives give access to the more interesting wrecks that are frequently more intact.

Even a shallow 30m/100ft dive has a short 30min limit (nitrox 32%) or 20min for air. Hardly worth dropping off the boat when you could do 75mins on the bottom at the same depth with about 45mins of deco — time in the water not having to have the pressures of the world upon you. It’s meditation time.

Many of us enjoy not being constrained by NDLs and have access to the good stuff lying well below. This week it’s diving on a dreadnaught battleship, a transatlantic liner, a freighter carrying many Sherman tanks and many other world class wrecks. All inaccessible with NDL limitations. Decompression times measured in hours are not uncommon.

All dives are decompression dives, some not requiring stops if you remain within strict limits. Any dive can bend a person given the right (or wrong) circumstances.

One person’s boredom is another person’s relaxation therapy. Thank goodness we’re all different.