Announcing the SubGravity H3 - Powered by SeaBear

[scubadada]

I believe that is essentially true. I recall reading (you like that citation?) that the "pure" Buhlmann ZHL-16C (i.e., GFs set to 100/100, i.e., zero conservatism) is estimated to result in a measurable incidence of DCS--like on the order of several percent. No Rec computer manufacturer would be crazy enough to let a diver dive that. I have to believe that all manufacturers add a safety or conservatism buffer, whether that's by gradient factors or some other means of providing a buffer.

Stuart, I can't speak to the sample dives you ran through the different computers. Maybe the tests I had in mind were done for a broader sample of dives, including dives that would necessarily involve deco stops. Maybe they were even based on Buhlmann A or B rather than C. I do not believe the Petrel allows the user to set 100/100 in normal mode, though. As someone else pointed out, the Petrel Recreational Mode's "Low" conservatism setting corresponds to 45/95.

I don't think your statement is correct, maybe you're thinking of early Navy tables? You certainly could use a better citation.

 

[Lorenzoid]

I don't think your statement is correct, maybe you're thinking of early Navy tables? You certainly could use a better citation.

I may have distilled my (incorrect?) understanding from several sources. I was under the impression that Workman and Buhlmann first developed the m-value concept, and then developed gradient factors as a way to add a buffer zone next to the m-value line because, to put it colloquially, an unacceptable number of people were showing symptoms of DCS. Adding to my confusion is that there was first Buhlmann's A model, and then the more conservative B, and then the still more conservative ZH-L16C, which I understand was developed with dive computers in mind. So maybe the m-values in Buhlmann ZH-L16C do not result in anything but the "vanishingly low" incidence of DCS that we have come to expect from our computers?

If I have one "complaint" about the book Deco For Divers, it's that the explanation of m-values doesn't clearly differentiate the general case from how it would work in the case of computing no-deco limits (NDLs).

 

[SubGravity]

We have received numerous questions concerning the size and position of the buttons on the SubGravity H3, powered by SEABEAR- specifically if they are usable with dry gloves. Here is a little video to ease your mind!

CLICK HERE TO WATCH VIDEO
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[Nuribromanski]

We have received numerous questions concerning the size and position of the buttons on the SubGravity H3, powered by SEABEAR- specifically if they are usable with dry gloves. Here is a little video to ease your mind!

CLICK HERE TO WATCH VIDEO
View attachment 215850​

Looks good! but why not shown buckled tight onto a wrist? seems liek buttons harder to reach then

 

[gizmo1972]

I Have my H3 i just cant wait to get it wet!!!!!! next week !!!!!!! bring on the transmitter!!!!

 

[tbone1004]

what he said. Most of the issues I've seen have been the finger contorting trying to hit them while they're on an inflated drysuit.

 

[SubGravity]

Looks good! but why not shown buckled tight onto a wrist? seems liek buttons harder to reach then

By special request for Nuribromanski:

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[tbone1004]

thanks for reaffirming that one. Never upset to be proven wrong!

 

[SubGravity]

I Have my H3 i just cant wait to get it wet!!!!!! next week !!!!!!! bring on the transmitter!!!!

Good to hear! Let us know what you think.

 

[Nuribromanski]

By special request for Nuribromanski:

View attachment 215870
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lol Not exactly on an inflated suit and no rings/seals in sight to get in the way, but much better for what you're trying to show than holding it in your hand