CAT calculation for GUE Fundies

[JohnN]

What ATA are you at the surface?

Ohhhh I love playing 20 questions. . . .

1 atmosphere at surface (unless you want to go full metric and talk about kPa)

 

[Lorenzoid]

You don't know CAT?
Consumption * Average ATA * Time

Don't know what PLAN is. Must be part of the new SOP.

I half-exaggerated. There was no CAT when I took Fundies in 2014--it was just called the Minimum Gas calculation without any handy mnemonic--but the new CAT mnemonic was covered when I took Doubles and Drysuit primers in 2016. As for PLAN, this is the first I've heard of it. I still have difficulty remembering all there is to remember during a GUE EDGE. Maybe GUE PLAN makes it easier?

 

[guruboy]

Ohhhh I love playing 20 questions. . . .

1 atmosphere at surface (unless you want to go full metric and talk about kPa)

So if you go from 4 to 1 at a constant rate, what's the average?

 

[Lorenzoid]

GUE EDGE is still GUE EDGE, and it's still the Dive Plan review tool.

HTH
John

Whew!

 

[JohnN]

No, it is 2.5 ata. At 100' you are at 4 ata. At the surface you are at 1 ata.

Brain fart, apparently too little coffee. . . It's a whole lot less mystical if you just calculate the pressure @ 50 fsw:

pressure = (50/33) +1

Again, that assumes a constant rate of ascent. . .

 

[CptTightPants21]

Whew!

Yeah, I'm glad GUE is keeping its edge. I would hate to see them slipping

 

[wetb4igetinthewater]

Brain fart, apparently too little coffee. . . It's a whole lot less mystical if you just calculate the pressure @ 50 fsw:

pressure = (50/33) +1

Again, that assumes a constant rate of ascent. . .

They also assume 10 feet per minute, which is quite slow (and safe). Also, fairly high SAC rates for both divers (though one can argue that under stress, one's SAC can really shoot up

 

[JohnN]

They also assume 10 feet per minute, which is quite slow (and safe). Also, fairly high SAC rates for both divers (though one can argue that under stress, one's SAC can really shoot up

10 minute ascent from 100 fsw ?

 

[Rainer]

10 minute ascent from 100 fsw ?

Nope. It's only 10'/min from half-depth (five minutes) plus 30'/min from 100'->50' (call that two minutes) equals seven minutes.

 

[CptTightPants21]

Nope. It's only 10'/min from half-depth (five minutes) plus 30'/min from 100'->50' (call that two minutes) equals seven minutes.

To make that clearer. For a no deco dive, ascend at 30ft per minute until you are half way between your average depth of the dive and the surface (for 100ft dive that is 50ft, for a 70ft average depth dive that would be 40ft). From the halfway point ascend 10 feet per min, typically 30 seconds to hold depth, 30 seconds to slide up to the next stop, 30 seconds to hold new stop.......