High altitude decompression diving

[lostsheep]

I have only done 20 dives at 8000ALT and 9 of them had been deco dives with that said I followed the equivalent depth chart IE 60 feet is 80feet at 8000ALT so I did all my dives in multideco with that in mind. And had 0 issue I also was at that ALT for 48 before the dives and after

Is there a reason for doing equivalent depth vs just changing the elevation setting to 8000’?

 

[Fishdip]

Is there a reason for doing equivalent depth vs just changing the elevation setting to 8000’?

I did not explain that the best. I still changed it in the tool but I also verified I was getting numbers that are correct. I find using a two step verification process not only stops my e-mail from getting hacked but also helps me catch mistakes like not changing the elevation back to the 4500 I dive at every day.

 

[J-Vo]

I haven't used anything but a Shearwater in a long time. Are there modern PDCs that still require you to manually set the altitude?

 

[Ulfhedinn]

On the topic of tissue update during the drive to altitude (i.e., off-gassing/equalization) the Perdix AI and NERD2 manuals state:

@J-Vo, was your computer on or off during the drive to Jefferson?

FWIW, Shearwater got back to me and said tissues are tracked/updated as long as the computer is on. The Teric is always on (even when the screen is dark). The Perdix/Petrel must be turned on before starting the drive up the mountain. This is contrary to the manual, so I'm inclined to think their emailed response is incorrect.

Turning it on before making the accent! Never even thought of that. I will be making an elevation dive (7200') this month so that is good to know.

 

[inquis]

Turning it on before making the accent! Never even thought of that.

Shouldn't need to if there's a battery in it. Manual says it wakes up/checks every 5 minutes when "off".

 

[boulderjohn]

I haven't used anything but a Shearwater in a long time. Are there modern PDCs that still require you to manually set the altitude?

Here are the instructions for setting the altitude for one of the Suunto models.

suunto altitude settings - Google Suche