Help with Buhlmann ZHL-16c GF

[scubadada]

I'm confused and could use help

I have read that Buhlmann intended using no higher than 90/90. Liquivision Lynx offers a default option of 100/100. Shearwater offers a rec setting of 45/95 and states that it matches PADI/NOAA NDLs. Though I cannot confirm, I've heard Oceanic PZ+ without conservatism runs something like 45/95. I've read that many choose to dive something like 30-40/85. I've also read that some, wishing to avoid deep stops, dive something like 75/85.

Can someone help shed light on this topic? More and more good computers appear to be running Buhlmann ZHL-16c with GF (Shearwater, Liquivison, Seabear, Dive Rite, Divesoft, xDeep...)

 

[tursiops]

Shearwater offers a rec setting of 45/95 and states that it matches PADI/NOAA NDLs.

Really? PADI RDP does not match NOAA, so how can 45/95 (or *any* GF) match them both?

 

[Jax]

A primer on gradient factors:

Gradient Factors for Dummies


Best book in the world:

Deco for Divers: A Diver's Guide to Decompression Theory and Physiology: Mark Powell: 9781905492299: Amazon.com: Books


Best to read and understand and decide for yourself.

 

[PfcAJ]

ask 10 different people for their opinions about gradient factors and youll get 11 different answers.

 

[scubadada]

Really? PADI RDP does not match NOAA, so how can 45/95 (or *any* GF) match them both?

Of course, you are correct. PADI and DSAT are pretty close, NOAA/Navy generally has a few more minutes of NDL

 

[wedivebc]

ask 10 different people for their opinions about gradient factors and youll get 11 different answers.

Not if you ask 10 people who know what they're talking about.

 

[CptTightPants21]

I am sure the links posted above will cover this and answer your question, but 100/100 is the Bulhmann deco algorithm. The gradient facts are percentages of the Bulhmann formula. Less than 100% gradient factors are more conservative and gradient factors greater than 100% are less conservative than the standard Bulhmann.

 

[tursiops]

Can someone direct me to where Shearwater says what its recreational GFs are?

 

[scubadada]

A primer on gradient factors:

Gradient Factors for Dummies


Best book in the world:

Deco for Divers: A Diver's Guide to Decompression Theory and Physiology: Mark Powell: 9781905492299: Amazon.com: Books


Best to read and understand and decide for yourself.

The article on Andy's site was not useful beyond my current understanding. I have the previous edition of Deco for Divers and have read it several times, is the new edition significantly different/updated?

 

[tursiops]

A primer on gradient factors:

Gradient Factors for Dummies


Best book in the world:

Deco for Divers: A Diver's Guide to Decompression Theory and Physiology: Mark Powell: 9781905492299: Amazon.com: Books


Best to read and understand and decide for yourself.

I hope this was not meant for me! My question was not about GFs, which I actually think I understand pretty well.
My question was about the alleged statement from Shearwater that their recreational mode is 45/95, and that it matches PADI/NOAA tables.