Feature Request : Bailout TTS

[Whitrzac]

The dive planner already has this feature. Sac rate/gas usage and everything.

I havent noticed any crazy differences in TTS between bailout and staying on the loop when planning bigger dives.
The main issue is if you're playing in the rec/tech boarderlands and run into deco without having deco gas. 10min of deco on a rb is like 45min on air if you have to bail out.

 

[Wibble]

The main issue is if you're playing in the rec/tech boarderlands and run into deco without having deco gas. 10min of deco on a rb is like 45min on air if you have to bail out.

Which begs the question about dive planning with CCR and why use air bailout if that's going to adversely affect the dive.

If it's a NDL dive on a rebreather to, 30m/100ft, the obvious bailout gas is 32%.

Also you will often be able to get back on the loop at 6m/20ft and breathe oxygen.

 

[LFMarm]

Just saw in a video from DEMA that the latest Garmin large screen computer has a field for Bailout TTS. Hopefully we will get it on Shearwater as well.

 

[Wibble]

Just saw in a video from DEMA that the latest Garmin large screen computer has a field for Bailout TTS. Hopefully we will get it on Shearwater as well.

Shearwater does this already??

Diving in CC mode it racks up the TTS according to the running PPO2 and diluent.

Switch to BO mode and select the correct bailout gases and it'll adjust in real time, just as your body absorbs/off gases. You can see this very easily at the beginning of your deco; increase or decrease your setpoint (or manually increase the PPO2) and you'll see the TTS fall/rise. That's the Δ5 setting too.

 

[Alex Ouroboros]

Showing my age (or when I started technical diving) with this one.
Any reasonably big dive I’m going to do I work out the old fashioned way with my old (A4 sized laminated) runtime table you used to get when doing the technical courses,
It’s basically a hand written runtime that looks like v planner or multi deco, (sometimes I do just use the bail feature on these but I like to keep my hand in) it takes time but you can work it out, I write the nuts and bolts of it in my wet notes across a couple of pages, in a way I find easily understandable.
The way I was taught was pretty regimented and there are rules of thumb you can follow, which I won’t go in to here, the big thing that does impact you is the necessity of good gas matching, again I had it drilled in to me,
As a result I can’t take anybody seriously that dives 10/50 (unless it’s a bit of a joke , ie hardly any deco at the end of a top up week)
I’m glad I did quite a few years doing OC technical, the gas matching, run time slates, and basic computer and timing device certainly made you less blasè compared to now.

 

[inquis]

After running a bunch of profiles in a planner, I'm fine using the CCR TTS as a surrogate for deco gas volume and wouldn't use a BO TTS field.

For various depths, I can find the max bottom times supported by my 50% bottle (and other various assumptions with which I'm comfortable, like GFs, RMVs, stress window, etc.). The resulting CCR TTS is always more than X mins, so I just stay under that for simplicity. Similar analysis can be done for two bottles (e.g., 50% & 100%), etc. to yield a limiting CCR TTS for each of those cases.

A BO TTS would just be a different number to be compared to a different limiting value, but they both ultimately tell me when I need to shallow up.

 

[LFMarm]

Shearwater does this already??

Diving in CC mode it racks up the TTS according to the running PPO2 and diluent.

Switch to BO mode and select the correct bailout gases and it'll adjust in real time, just as your body absorbs/off gases. You can see this very easily at the beginning of your deco; increase or decrease your setpoint (or manually increase the PPO2) and you'll see the TTS fall/rise. That's the Δ5 setting too.

I have not seen what Garmin implemented in detail but I expect is showing you in real time what your TTS outlet be if you would bail out at that point in time while still on CC mode.

 

[LFMarm]

Here it is