Safety stop feature request

[rsingler]

I've hit surface gf of 99 a couple of times. Would be nice if the computer could show safety stop info based on surface gf.

I misspoke. I have rarely been above the 70's after surfacing with a 5 min safety stop. Yes, at depth, I'll see SurGF over 100. But it dissipates as I ascend above 30 ft.

 

[boulderjohn]

Would be nice if the computer could show safety stop info based on surface gf.

You can make that decision for yourself easily enough.

I did a number of relatively shallow reef dives this winter using EANx 36. When I got up to SS depth, my SurfGF was in the 40s. I did a SS because my buddy's computer was counting down the 3 minutes. On my own, I would have simply surfaced.

 

[CWK]

Run some sample dives on Subsurface with your SAC and GF99/75. Find out predicted gas consumption with varying depths and SS lengths.

Come up with a gas requirement based on Time to Surface. For me, it's about 1.2 CuFt/min TTS, decreasing a bit with deeper dives. Add your safety factor, and maybe double it if you want enough gas for your OOA buddy, and you have a rock bottom model that is based on GF.

Takes a little playing on the computer, but it solves your issue completely. Track your evolving TTS based on 99/99. Add the extra SS minutes that are required to get you to 75. That's your revised TTS.

Revised TTS x 1.2 = my required gas reserve in CF not including safety margins.

There are lots of workarounds. What I am actually doing now, since I have 2 computers, is as follows:

Teric
Rec mode 99/99

Perdix
Tec mode 75/75

The Teric gives me my NDL, the Perdix gives me my safety stop info but as a deco stop. I'm trying to combine the two into one computer that shows the stop as a safety stop as long as I do not exceed m-value.

 

[CWK]

I misspoke. I have rarely been above the 70's after surfacing with a 5 min safety stop. Yes, at depth, I'll see SurGF over 100. But it dissipates as I ascend above 30 ft.

In my experience, square profiles to near m-value would still result in surface gf over 75 after a 5 minute safety. My longest safety to get surface gf below 75 is just over 9 mins.

 

[rsingler]

In my experience, square profiles to near m-value would still result in surface gf over 75 after a 5 minute safety. My longest safety to get surface gf below 75 is just over 9 mins.

I'm sure you're right. But I'm usually mosey'ing up the reef for the last half, instead of a square wave profile.
We're not so far apart.

 

[CWK]

I'm sure you're right. But I'm usually mosey'ing up the reef for the last half, instead of a square wave profile.
We're not so far apart.

Blue water diving. No reef.

 

[NAM001]

If you do not exceed your NDL, you can go directly to the surface and not exceed GF high. No SS, nothing. You can choose to stop and decrease your SurfGF to whatever you desire.

thats kind of the point that is not taught in OW or AOW classes now because they do not incorporate GF's in training. It has long been a discussion on why any rec diver not in deco should by definition ever have to do a SS. Its always just in case if...... now we have GF info available if computers will only display it. as far as computer settings so it can be done easily. add GF surf to the choice of SS set up as an added method to the off 3 5 dynamic settings you dont even have to know anything about GF's you base it on the conservitism setting as the trigger for surface time and gf surface is already in the computer. the more conservitism the shorter the NDL and / or the longer the SS.

 

[boulderjohn]

thats kind of the point that is not taught in OW or AOW classes now because they do not incorporate GF's in training. It has long been a discussion on why any rec diver not in deco should by definition ever have to do a SS. Its always just in case if...... now we have GF info available if computers will only display it. as far as computer settings so it can be done easily. add GF surf to the choice of SS set up as an added method to the off 3 5 dynamic settings you dont even have to know anything about GF's you base it on the conservitism setting as the trigger for surface time and gf surface is already in the computer. the more conservitism the shorter the NDL and / or the longer the SS.

Very few recreational computer use Buhlmann, so they can't do GFs.

 

[KenGordon]

If I recall correctly, Teric allows a choice of either 3 or 5 minutes fixed duration safety stops. I would love to be able to set safety stop that’s variable in duration but fixed in terms of safety margin below m-value, ie surface gf.

Say I were to set gf hi/low to 99/99 for max NDL, I want to be able to set a safety stop of surface gf not exceeding 75 an let Teric tell me the ceiling and duration of the safety stop.

Two points:

* Can the boat tell you were in deco for a /75 setting after you get out?
* Why does the boat ask that you don’t go into deco?

Can’t you just be honest with everyone and do a deco dive? If the boat really will not allow it, is that short hand for longer dives not being allowed? Or hanging about on a blob for 15 minutes not being allowed?

 

[CWK]

Two points:

* Can the boat tell you were in deco for a /75 setting after you get out?
* Why does the boat ask that you don’t go into deco?

Can’t you just be honest with everyone and do a deco dive? If the boat really will not allow it, is that short hand for longer dives not being allowed? Or hanging about on a blob for 15 minutes not being allowed?

As far as I am concerned, a dive is not a deco dive if it does not exceed m-value. You can stop and offgas from m-value to a lower surface gf for conservatism. That greater conservatism, to me, is a safety margin and the stop is a safety stop.