TTS is adding Safety Stop (3')
Posted by: Raf ()
Date: August 02, 2019 01:58PM

Hello,

After an upgrade to the latest firmware i noticed that the TTS is alwyas 3' more.
I have disabled the safety stop (3' on 3m), but i think that the TTS stil adding this.
Is this normal?
Can this be a TTS without the safety stops included.

Attachments: 20190727_153748.jpg (918.7 KB)  
Re: TTS is adding Safety Stop (3')
Posted by: Ralph ()
Date: August 02, 2019 08:35PM

Hi,

the extra 3 mins do not result from a safety stop, but from a reduced ascent speed of 1 m/min for the final ascent. So if last stop is set to be at 3 meters, there will be 3 minutes added. This will mount up to 6 minutes with a last stop at 6 meters. That was introduced along with the gas needs calculation to add some safety margin on the figures. As the tissue saturations peak on the final meters to the surface, it's wise to slow down and take these extra minutes on the final ascent.

Ralph

Re: TTS is adding Safety Stop (3')
Posted by: heinrichsweikamp ()
Date: August 03, 2019 03:03PM

We get this question often with the current version.

What do others think? Should we remove the extra minutes from the displayed TTS?

regards,
Matthias

Re: TTS is adding Safety Stop (3')
Posted by: Kehrmaschine ()
Date: August 03, 2019 06:12PM

I am not disturbed by this. Ascending to the surface from the last stop with 1 m/min is a good thing. It gives you a realistic TTS anyway. If you want to go faster for any reason, you have some spare time. I wouldn‘t change it.

Re: TTS is adding Safety Stop (3')
Posted by: algo ()
Date: August 03, 2019 08:14PM

I also think this is a valuable information and reminds you, that a slower final ascend to the surface is better. So i would leave it like it is.

(And if you get a lot of questions about this, it also means that people realize it and don’t unterstand it , but start thinking about this)

Re: TTS is adding Safety Stop (3')
Posted by: Clownfish ()
Date: August 04, 2019 12:15PM

I think there is no need to add more than one minute to TTS for ascent from 5 metres. Sure, you should take more, but it just causes confusion when it is 5 minutes.

Michael
Sydney
Australia
OSTC 2 11528

Re: TTS is adding Safety Stop (3')
Posted by: U-96 ()
Date: August 05, 2019 08:29PM

Hi all

Since I dive with an OSTCplus I'm always the guy with the highest TTS value.

I don't see really an advantage in this behavior. During the dive, in my mind I often subtract 2' of the TTS to have an equivalent TTS like my bodys computer. Furthermore, after the deco the TTS value goes immediately down from 4' to 0' and there is no count down running.

Michi
OSTC 2C 7452
OSTCplus 17296

Re: TTS is adding Safety Stop (3')
Posted by: ClaudeDive ()
Date: August 05, 2019 10:03PM

Hi Matthias and Ralph,
To adjust this point, I think that it may be necessary to have a setting of 1 to 3 m / min of the ascent rate of the last deco stop,

ClaudeDive ><)))))°> OSTC3 #2430 <°(((((><

Re: TTS is adding Safety Stop (3')
Posted by: Rob ()
Date: August 06, 2019 06:47AM

Hi Ralph,
hi Matthias,

according to the fact that it is much more healthy to reduce the speed in the last meters before surfacing, it is a good reminder for those pepole who are not so deep in decompression theory.

I held a CMAS** course (we teach 1m/min during the last 5 meters) and the divers with ostc told me that it is a good idea to be reminded to the slow ascent.
The one with ostc and the latest firmware was the one who didn't forget to slow down.

So, from my point to view - well done. Let it as it is.
The reality proofs that this is a good idea.

And for those who are not interested in slowing down, come on, three minutes at a depth of 3-2-1 m - who really cares.

Regards
Rob

Home: [www.angermayr.eu]
email: ostctools@angermayr.eu
Home of OSTC Tools: [ostctools.angermayr.eu]
HWOSConfig for Android: [play.google.com]



Edited 1 time(s). Last edit at 08/06/2019 06:56AM by Rob.

Re: TTS is adding Safety Stop (3')
Posted by: Arno ()
Date: August 06, 2019 08:41AM

Leave it as it is, the added benefit of a slow ascent during the last 3 meters outweighs the fact that a faster ascent is possible.

If need be than add a setting so those who are really annoyed by it can turn it off, but then again those people count with maybe 10m/minute and they can do the math themselves if they are on 20 meters with no deco obligation. And with deco obligation it's even more beneficial to slow down and those extra 3 minutes really don't matter a lot anymore.

Re: TTS is adding Safety Stop (3')
Posted by: Ralph ()
Date: August 06, 2019 07:54PM

Hi all,

thanks a lot for your answers and especially the reasonings behind. Due to the works that have currently been done (and will ship with the next beta to come), the TTS itself will not include extra minutes for a slowed final ascent any more. But providing some means to remind divers to take it slow did convince me to be some favourable thing to have. I'll probably write some code that will write a "slow" reminder at the place were otherwise the NDL 240' will appear after the last deco stop has cleared. I hope that will serve all the thoughts you shared with us.

best regards
Ralph

Re: TTS is adding Safety Stop (3')
Posted by: Clownfish ()
Date: August 07, 2019 11:23AM

Ralph, sounds great.

Michael
Sydney
Australia
OSTC 2 11528

Re: TTS is adding Safety Stop (3')
Posted by: ClaudeDive ()
Date: August 07, 2019 03:21PM

Yes, Ralph,

Perfect you could use "Slow I" (Slow with the little arrow up, sur un fond jaune) to remind the diver to slow down from the last deco stop to surface (the same little arrow you used for gas "Work" but to the surface)

Best Regards,

ClaudeDive ><)))))°> OSTC3 #2430 <°(((((><



Edited 2 time(s). Last edit at 08/07/2019 03:23PM by ClaudeDive.

Re: TTS is adding Safety Stop (3')
Posted by: Ralph ()
Date: August 07, 2019 07:51PM

You mean like this?

:-) Ralph

Attachments: slow.jpg (20.5 KB)  
Re: TTS is adding Safety Stop (3')
Posted by: ClaudeDive ()
Date: August 07, 2019 09:21PM

Yes Ralph perfect! That's so clear,hot smiley
Best regards,

ClaudeDive ><)))))°> OSTC3 #2430 <°(((((><

Re: TTS is adding Safety Stop (3')
Posted by: dadefay ()
Date: August 10, 2019 09:50AM

Hi guys,

The last Ralph's proposal seems the best solution, along with an updated user manual given the number of improvements and changes ! Otherwise, the forum will be deluged with questions !

Kind regards.

Didier A. Defay
OC trimix instructor / ART CCR diver
France

OSTC Plus #16077
- OSTC 3+ #4806
-- OSTC 3 #3999

Re: TTS is adding Safety Stop (3')
Posted by: Ralph ()
Date: August 10, 2019 03:30PM

Hi Didier,

thanks for your point. We'll try to make the release note as comprehensive as possible. There is so much functionality in the Firmware, it is impossible to put everything in the printed manual. We counsel everyone to play a lot with the dive simulator, including doing nasty things like violating stops, choosing wired gases and so on, to learn what the OSTC will do.

save diving,
Ralph

Re: TTS is adding Safety Stop (3')
Posted by: heinrichsweikamp ()
Date: August 10, 2019 03:42PM

Hi,

The manual will get an update, of course. And for the stable I might tweak the default values (Extended Stops, Gas Change time) a bit to be similar with the last stable.

regards,
Matthias

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