EVERYTHING YOU NEED about Altitude Diving - Essential Techniques for Diving Altitude FULL CLASS

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@askingdiver 7 ай бұрын

1:12:13 Yes, Divesoft also adjusts automatically for altitude. Also it takes into an account adaptation to dive site altitude when arriving to the location and also shows maximum altitude you can climb to after the dive. 1:13:13 Suunto when used with RGBM (on Steel you can also use Buhlmann ZHL) you need to set the altitude manually because the algorithm takes it into the account and adjusts conservatism. (confirmed by Suunto support)

@TeachMeToDive 7 ай бұрын

Thank you for the information. The challenge with the divesoft is that very few divers turn them on prior to leaving the beginning destination. IE driving into the mountains, so it is unable to take that information into account. The Suunto must be manually set to the altitude range. So this provides two issues. 1. it is using a range instead of the barametric pressure like its competitors, and 2. it is something that can easily be forgotten. (pointing finger at myself in two direction fist, forgetting to change it after vacation diving at sea level. second, forgetting to change it after altitude diving and traveling to sea level lol. Although that has been a long time ago, and I only dive the Suunto at altitude for very particular dives like ice diving and FFM twin sets). :) Again, thank you for your comments :)

@askingdiver 5 ай бұрын

@@TeachMeToDive One more note. Some dive computers (didn't find it in the Suunto or Divesoft manuals, so don't have example) check the altitude even switched off, to be able account with the adaptation to altitude prior the dive. But still the best practice is to activate the dives prior the dive.

@TeachMeToDive 5 ай бұрын

@@askingdiver the biggest challenge with "switching them on prior to a dive" is that most divers only can or will turn them on "just" prior to the dive, not at their equalbriation altitude (the altitude that they start at) so the dive computer has no way to take into account the rise to altitude. Garmin Mk series, and Shearwater Teric both can, since they are generally worn as a daily as well so they are able to more closely be in tune with the diver. Divesoft is a great computer for sure, but most typically sleeps in a dive bag until needed :) Same thing for Suunto Steel. :)

@kailaurila5137 4 ай бұрын

Great course to watch! Isn't MOD technically deeper when you dive on altitude? Lets say 3000ft. ((1.4/0.209)-0.896)*10*3.28 =190feet At sea level (1ATM) ((1.4/0.209)-1)*10*3.28 =187feet

@TeachMeToDive 4 ай бұрын

So this is one of the great misconceptions out there in terms of Altitude diving :) so lets think our way through it for a moment :) What is the weight of a cuft of water at sea level (for this we will stick to fresh water and then discuss salt water)? A: 1 Cubic Ft. = 62.41 Lbs. 1 Gallon = 8.34 Lbs. Now, what is the weight of the same volume of water at 10,000 feet of elevation? A. 1 Cubic Ft. = 62.41 Lbs. 1 Gallon = 8.34 Lbs. With this concept, the weight is unchanged. If this weight is relatively unchanged, for force it exerts is unchanged and the Partial Pressure of any gasses as we descend are unchanged. The challenge with diving at altitude, primarily, stems from the reduction in atmospheric pressure change from below the surface to above the surface of the water. We have a sudden drop in pressure that must be accounted for. Below the water the weight of the water is constant and creates an ATA of 2 at 34 FFW. BUT, above the pressure of the water, the ATA is now .711 or 10.2 PSI. Now, this is different, of course with salt water and 2 ATA in FSW is 33 due to the salinity :)

@kailaurila5137 4 ай бұрын

@@TeachMeToDive But if we start dive from 3000ft altitude with air isn't the PP02 0,187264 at surface? (20.9%×0.896) To reach PP02 of 0,209 (sea level) you need dive to 3ft depth? I don't want to quarrel. I just want understand :)

@TeachMeToDive 4 ай бұрын

@@kailaurila5137 Certainly is confusing. Gas density and Partial pressure are created by the weight of the water itself. The variance that is needed in NDL times for diving at altitude is based on this. It isn't that we are diving to a deeper depth, it is to correct for the sudden reduction in atmospheric pressure experienced by the diver at surfacing. While above the surface we have a significant reduction in the atmospheric pressure (while at altitude), BUT, below the water, we have the same pressure no matter what the altutde. The weight of the water doesn't change dependent on the altitude and creates the same pressure dynamic at every altitude or lack of altitude. :) It is a rough one for sure, and it is easy to miss. Honestly, this is one that I struggled with for a long time and took it to the physics experts for clarification.

@jonnysalpino6851 4 ай бұрын

It would be awesome to dive Idaho with you, how can one go about doing that?

@TeachMeToDive 4 ай бұрын

Well, getting to Idaho would be the first step :) lol We will be here until Sept before we move to our winter diving location :) Just let us know what you are thinking :) and I sure we could do something :)