So, who is going to market an inexpensive rec computer running Buhlmann with GF?

[Vicko]

Because it's not proprietary and users won't have to guess about what it's actually doing.

90% of the users don't know what exactly their Sherwaters are doing either (neither do I and I'm actually interested in it)

What are the practical differences between RGBM and Bulhman algorithms in no-deco or light deco dives? Customizable dive computers don't have a actual point in recreational diving except to add a degree of human error.

 

[scubadada]

Most divers would be satisfied with several, well chosen, preset GFs on an inexpensive computer running Buhlmann. Perhaps something like Shearwater's 45/95, 40/85, and 35/75. All, or nearly all, current dive computers have a means to adjust conservatism. It is in a diver's best interest to know how their computer is set and how it works.

 

[Vicko]

. All, or nearly all, current dive computers have a means to adjust conservatism. It is in a diver's best interest to know how their computer is set and how it works.

I know they have them but I don't belive that a large company would open itselfs to lawsuits by putting in a liberal seting that is unsafe for old, fat, alchocolic divers with a deathwish. So if their most liberal setting is safe why would I ever use the conservative one.

And I don't belive for a second that the average dive computer owner particulary cares how their computer functions.

Here on this forum we are all sport enthusiast, some of the most vocal members are tech divers and instructors, of course all of us would like a computer we can fiddle with and personalize it(i would really like a Hello Kitty housing for my Petrel btw), but we are far removed from a average vacation diver .

 

[scubadada]

...I don't belive that a large company would open itselfs to lawsuits by putting in a liberal seting that is unsafe for old, fat, alchocolic divers with a deathwish...

DSAT is best approximated with a GF hi of around 95. DSAT has been in widespread use for 31 years. Shearwater includes a preset GF of 45/95 in the rec mode of its computers.

 

[rongoodman]

What are the practical differences between RGBM and Bulhman algorithms in no-deco or light deco dives? Customizable dive computers don't have a actual point in recreational diving except to add a degree of human error.

The problem is that you can't even say for sure what "RGBM" means in the context of most of the recreational computers which claim to use it. It's unlikely that they have the computational power to run RGBM, but there's really no way of knowing. The only claim of an actual full implementation of RGBM that I'm aware of was an aftermarket upgrade for the now defunct Liquivision Xeo.

 

[dmaziuk]

What are the practical differences between RGBM and Bulhman algorithms in no-deco or light deco dives?

FVO "RGBM" = "what sub-$300 recreational computers run": nobody knows.

I think the question you want to ask is how various RGBM fudge factors affect multi-day multi-dive schedules -- vs. Buhlman+GF. Because that's the target use/demographic for Zoops etc., as I understand it. I think there's about one person on this board doing this kind of diving with both Giotto and Perdix , and she probably has a statistically significant data set of two (count 'em) dive trips by now.

 

[dmaziuk]

The only claim of an actual full implementation of RGBM that I'm aware of was an aftermarket upgrade for the now defunct Liquivision Xeo.

No.. there is another.

 

[Vicko]

FVO "RGBM" = "what sub-$300 recreational computers run": nobody knows.

I think the question you want to ask is how various RGBM fudge factors affect multi-day multi-dive schedules -- vs. Buhlman+GF. Because that's the target use/demographic for Zoops etc., as I understand it. I think there's about one person on this board doing this kind of diving with both Giotto and Perdix , and she probably has a statistically significant data set of two (count 'em) dive trips by now.

I have 480 dives on my Suntoo D6i, had around 300 dives on a D4 and have around 50ish with a Petrel 2 runing 45/90.
I can safely say that Suntoo RGMB really really likes a surface interval, less then a hour between dives (even if the first one of them was fixing a propeller or a discovery) means your NDL is 1/3 of normal, may be less. After about 3-4 hours it does not care as much even if you are doing 2 deco dives it will give you predictable NDLs and deco times.

Major difference is in how much deco it gives you, after 10 minutes of deco Suntoo goes crazy and gives you almost double the deco time of the Petrel.

I often have 20ish repetitive dives in a row during a week and I don't see that much difference between the two on rec dives, Suntoo gives me a bit less NDL depending on the surface interval from last dive.

 

[vovanx]

I have 480 dives on my Suntoo D6i, had around 300 dives on a D4 and have around 50ish with a Petrel 2 runing 45/90.
I can safely say that Suntoo RGMB really really likes a surface interval, less then a hour between dives (even if the first one of them was fixing a propeller or a discovery) means your NDL is 1/3 of normal, may be less. After about 3-4 hours it does not care as much even if you are doing 2 deco dives it will give you predictable NDLs and deco times.

Major difference is in how much deco it gives you, after 10 minutes of deco Suntoo goes crazy and gives you almost double the deco time of the Petrel.

I often have 20ish repetitive dives in a row during a week and I don't see that much difference between the two on rec dives, Suntoo gives me a bit less NDL depending on the surface interval from last dive.

my D6i Novo is closer to 35/95

 

[scubadada]

my D6i Novo is closer to 35/95

Interesting comment. Do you base this upon going into deco, where GF lo would kick in? Do you dive a Buhlmann backup in order to make this comparison? For 1st dive I can imagine that Suunto could be close to GF hi of 95, doubt that it is true on repetitive dives, particularly with shorter SIs and/or deco on previous dive.