GF LO

[Capt Jim Wyatt]

While I realize this has been addressed in other forums I am wondering what you guys are doing for GF LO?

For years I have been using GF LO at 30. I was advised to do this by a hyperbaric doc who is a NOAA DMO, amongst other credentials.

These days I am reading where folks are using 50 as GF LO based partly on Simon Mitchells' discussions on this.

 

[tbone1004]

your recommendation is the same reason that Shearwater has/had 30/70 as the default on their computers. Pollock came out saying around 80% of your GF-Hi which is what I use so either 50/70 or 60/80

 

[Tribal]

Using 30 aswell but more and more people around me are changing to higher numbers.

 

[Preach]

35/80.

Edit: I think it also depends a lot on what kind of dive it is. Some serious deep diving is different from some light deco dives (up to 15 min of deco).

 

[tbone1004]

35/80.

Edit: I think it also depends a lot on what kind of dive it is. Some serious deep diving is different from some light deco dives (up to 15 min of deco).

set it for the serious deep dives, the shallow stuff doesn't use GF-lo much...

 

[Preach]

set it for the serious deep dives, the shallow stuff doesn't use GF-lo much...

I started off with vpm+2 (buhlmann 20-85)
Later changed it to 35/80

Never had signs of DCS that i know of.
I think it's a complicated subject. It's different for every person, but it's also not a thing to play around with to see what happens.
An instructor who makes deep dive's almost every day would probably have more feeling for this than someone who has to travel to make such dives, like me. I just use what is being taught in the courses i did.

Do you also use 50/80 for deeper dives beyond the 250 feet range? Did you ever experiment with your GF's and noticed differences between them? Like in fatigue?

 

[barth]

20/85

 

[tbone1004]

I started off with vpm+2 (buhlmann 20-85)
Later changed it to 35/80

Never had signs of DCS that i know of.
I think it's a complicated subject. It's different for every person, but it's also not a thing to play around with to see what happens.
An instructor who makes deep dive's almost every day would probably have more feeling for this than someone who has to travel to make such dives, like me. I just use what is being taught in the courses i did.

Do you also use 50/80 for deeper dives beyond the 250 feet range? Did you ever experiment with your GF's and noticed differences between them? Like in fatigue?

yes though I haven't done a ton of comparative dives between them to compare but I do know I feel better with 50/70 or 50/80 than I did with 30/70. Other friends feel the opposite, but I've had some pretty big knee trauma over the years so it works for me.

 

[JonG1]

I was at other end of spectrum, minor shoulder bend diving 80/80, so dialled back to 50/75 and been fine since.

 

[Capt Jim Wyatt]

it's also not a thing to play around with to see what happens.

Agree totally.

It is not an inherently intuitive thing unless you are Simon Mitchell or one of his colleagues.