Rock Bottom/Minimum gas

Hilde · December 25th, 2005, 02:19 PM

Hi,

I have heard that there are several versions of rock bottom?
What’s changed (since 2004)? What’s the right one?

Thanks,
Hilde

Hilde · December 25th, 2005, 02:35 PM

Quote: (Originally Posted by Hilde)

Hi,

I have heard that there are several versions of rock bottom?
What’s changed (since 2004)? What’s the right one?

Thanks,
Hilde

PS: Forgot something:
Minimum Gas
This is how I learn it…

*Sawyer* · August 16th, 2006, 04:54 PM

Hilde, this is pretty much how we still teach it.

However, note that after a recreational (no-decompression) dive you make your first stop at 50% instead of 80%.

An 80% deep stop is a bit aggressive for recreational profiles, and you might actually still be ongassing at that depth even though you are ascending.

*Hassan Adly* · August 16th, 2006, 11:16 PM

It's now called MGR (Minimum Gas Reserve), and as mentioned above the deco rules for the recreational range now call for the first stop to be shallower.

Otherwise there is no reason I can think of to change anything.

Joe Hesketh · August 17th, 2006, 01:49 AM

Quote: (Originally Posted by Hassan Adly)

It's now called MGR (Minimum Gas Reserve)

Not another name change

Incidentally, can someone please explain to me exactly why "rock bottom" is allegedly so offensive or unsuitable? Genuine question.

*Hassan Adly* · August 17th, 2006, 01:54 AM

It's nearly impossible to translate the term "rock bottom" to non-english speaking students.

Joe Hesketh · August 17th, 2006, 01:59 AM

Quote: (Originally Posted by Hassan Adly)

It's nearly impossible to translate the term "rock bottom" to non-english speaking students.

Aha, the "G" in "GUE"

cmalinowski · August 17th, 2006, 07:40 PM

Quote: (Originally Posted by Hassan Adly)

It's nearly impossible to translate the term "rock bottom" to non-english speaking students.

Cool. I did not know this either. Wasn't curious enough to post, but am now happy someone asked

Chris

December 25th, 2005, 02:19 PM	#1 (permalink)
Hilde(Offline) New Member Join Date: Dec 2005 Location: Antwerp/Belgium Posts: 18	Rock Bottom/Minimum gas Hi, I have heard that there are several versions of rock bottom? What’s changed (since 2004)? What’s the right one? Thanks, Hilde

December 25th, 2005, 02:35 PM	#2 (permalink)
Hilde(Offline) New Member Join Date: Dec 2005 Location: Antwerp/Belgium Posts: 18	Quote: (Originally Posted by Hilde) Hi, I have heard that there are several versions of rock bottom? What’s changed (since 2004)? What’s the right one? Thanks, Hilde PS: Forgot something: Minimum Gas This is how I learn it… Last edited by Clare Gledhill; December 26th, 2005 at 06:50 PM.

August 16th, 2006, 11:16 PM	#4 (permalink)
Hassan Adly(Offline) GUE Instructor Join Date: Feb 2006 Location: Red Sea Posts: 287	It's now called MGR (Minimum Gas Reserve), and as mentioned above the deco rules for the recreational range now call for the first stop to be shallower. Otherwise there is no reason I can think of to change anything. __________________ Hassan Adly Red Sea Discovery "Today I will finally see the sea again, which will smell of salt, wind, sand - and the cold of winter. Finally I will not only travel on it but dive in it, again I will become water, a bird - and I will remember the feeling of gliding above the abyss" Elena Sundukova, tragically lost at sea, January 2007

August 17th, 2006, 01:54 AM	#6 (permalink)
Hassan Adly(Offline) GUE Instructor Join Date: Feb 2006 Location: Red Sea Posts: 287	It's nearly impossible to translate the term "rock bottom" to non-english speaking students. __________________ Hassan Adly Red Sea Discovery "Today I will finally see the sea again, which will smell of salt, wind, sand - and the cold of winter. Finally I will not only travel on it but dive in it, again I will become water, a bird - and I will remember the feeling of gliding above the abyss" Elena Sundukova, tragically lost at sea, January 2007 Last edited by Hassan Adly; August 17th, 2006 at 01:58 AM.

August 16th, 2006, 04:54 PM	#3 (permalink)
Sawyer(Offline) GUE Instructor Join Date: May 2006 Location: Oslo, Norway Posts: 25	Hilde, this is pretty much how we still teach it. However, note that after a recreational (no-decompression) dive you make your first stop at 50% instead of 80%. An 80% deep stop is a bit aggressive for recreational profiles, and you might actually still be ongassing at that depth even though you are ascending.

August 17th, 2006, 01:49 AM	#5 (permalink)
Joe Hesketh(Offline) New Member Join Date: Nov 2005 Location: London, UK Posts: 657	Quote: (Originally Posted by Hassan Adly) It's now called MGR (Minimum Gas Reserve) Not another name change Incidentally, can someone please explain to me exactly why "rock bottom" is allegedly so offensive or unsuitable? Genuine question.

August 17th, 2006, 01:59 AM	#7 (permalink)
Joe Hesketh(Offline) New Member Join Date: Nov 2005 Location: London, UK Posts: 657	Quote: (Originally Posted by Hassan Adly) It's nearly impossible to translate the term "rock bottom" to non-english speaking students. Aha, the "G" in "GUE"

August 17th, 2006, 07:40 PM	#8 (permalink)
cmalinowski(Offline) New Member Join Date: Dec 2005 Location: Columbia, MD--USA Posts: 175	Quote: (Originally Posted by Hassan Adly) It's nearly impossible to translate the term "rock bottom" to non-english speaking students. Cool. I did not know this either. Wasn't curious enough to post, but am now happy someone asked Chris