Garmin Descent MK2

[ATJ]

I'm guessing this is an error on the Australian site
Garmin Descent™ Mk2i | Dive Watch

There's the base version of Mk2i, then a bundle version which includes the transmitter, air spool and spare brand, and then a third version which also includes the transmitter and air spool?

 

[ginti]

Another benefit is that the computer keeps track of on-gassing during other activities, like spending time at altitude (mountain biking, or hiking) then coming down a few thousand feet to dive, you'll start your dive with a percentage of nitrogen saturation, which was calculated during your other activities.

Really does the garmin do it? I am more than surprised... is there anything in the manual about it? Just to understand how it works and which algorithms they are using, and if these algorithms come from peer reviewed science

 

[ginti]

The air Integration transmitter uses sonar underwater and ANT on the surface. The descent reads Heart rate underwater and on the surface on the wrist and does not need a chest strap, although it can use one on the surface or swimming but none of the chest straps are pressure rated for diving.

I dive with dry suits, so the wrist sensor isn't an option for me....

 

[irycio]

Really does the garmin do it? I am more than surprised... is there anything in the manual about it? Just to understand how it works and which algorithms they are using, and if these algorithms come from peer reviewed science

I guess you could use the same Buhlmann just with a different ambient pressure (e.g. <1 bar from the top of your hike, and then you can slightly saturate when you come down to 1 bar). I would be very surprised if it included you breathing more heavily during the exercises as a contributing factor though

 

[ginti]

I guess you could use the same Buhlmann just with a different ambient pressure (e.g. <1 bar from the top of your hike, and then you can slightly saturate when you come down to 1 bar). I would be very surprised if it included you breathing more heavily during the exercises as a contributing factor though

The buhlmann (and actually all the diving algorithms) works well under certain conditions, and it was tested under these conditions (p>1bar). But has it ever been tested for pressures lower than 1bar? I can't recall anything about it, but I am ignorant about this topic, so I am surely missing something...

EDIT: About heavy breathing during exercises, do you mean heavy exercise pre- or after- diving? If yes, even in this case there is a lack of knowledge in literature as far as I know... but if the discussion goes so deep we better ask some medical moderators

 

[ginti]

I want to buy one just to look like a rich Rambo! To me its all about the look..and i might just get certified soon.

You liked that stuff

 

[irycio]

The buhlmann (and actually all the diving algorithms) works well under certain conditions, and it was tested under these conditions (p>1bar). But has it ever been tested for pressures lower than 1bar? I can't recall anything about it, but I am ignorant about this topic, so I am surely missing something...

EDIT: About heavy breathing during exercises, do you mean heavy exercise pre- or after- diving? If yes, even in this case there is a lack of knowledge in literature as far as I know... but if the discussion goes so deep we better ask some medical moderators

Well, it's not tested, but as if that ever prevented someone from using something . Still, it's linear in pressure, so far moderate altitudes it should be fine. As for exercise, I thought consensus was that heavy exercising while desaturating increased DCS risk. So in that sense doing 8000m in a flash is a bad idea.

 

[vjb.knife1]

I dive with dry suits, so the wrist sensor isn't an option for me....

That's too bad. I have owned several Unisuits and a Viking dry suit and now they are gone and I will never dive a dry suit, a hotwater suit or a wetsuit over 4 mm again.

 

[TuckerIdaho]

So you don't have the Garmin Dive app on your phone? How useful is the Garmin Connect app for dive data?

Connect has the same info the dive app does. After the beta test both were updated.

 

[ginti]

Well, it's not tested, but as if that ever prevented someone from using something .

People do a lot of things tha I don't agree with. Using something that is not tested, is one of these things.

Besides, here we are speaking about a company using a non-testend algorithm inside one of its devices; can you imagine the troubles if somebody gets hurted?

Still, it's linear in pressure, so far moderate altitudes it should be fine.

The fact that the model is linear just means that scientists "linearized" the behaviour of human body. Under which assumptions? I just do not know. Is it safe to use it at moderate altitude? Maybe yes, maybe not. What is a moderate altitude? The discussion can get a bit complicated.

There is a post from @boulderjohn somewhere here on SB, if I remeber well. I recall that there is no scientific data to understand how things change with altitude, so divers usually are very conservative. I don't have a lot of experience, so if you are more interested in the subject you can search that topic or ask John. And maybe you can correct me if I am wrong

As for exercise, I thought consensus was that heavy exercising while desaturating increased DCS risk. So in that sense doing 8000m in a flash is a bad idea.

Yes, this is the consensus; and, if I remember well, also heavy exercises just before diving is considered dangerous. But these are just guidelines, and they are not enough to build an algorithm...



My point here is just that, with such a lack of data, I would be really surprised if a company starts using this algorithm in this unknown piece of land, given the legal risk.

But I am ready to change my mind and to feel surprised