OSTC3 GF_high smaller than 70?

[cyril]

Hi,

on my OSTC3 I'd like to have a more conservative GF_high. But it seams not possible to set values between 70 and 110. Is there a way to get smaller values?

Regards,
cyril

[heinrichsweikamp]

No, 70 is the most conservative setting.

Regards,
Matthias

[cyril]

Hi Matthias,

is this a permanent problem or will this change in future firmware updates?

Regards,
cyril

[wrobell]

hey Cyril,

why do you need less than 70% gf high?

[cyril]

Hi,

because my instructor said so.
Have a look at: read.php?2,12060

Bye,
cyril

[Olaf70]

Just extend your latest stop by your own calculations. You do plan your dive don't you.

[adrian-bluescuba]

This is not a problem. Its is conservative enough.

[kscksc]

@cyril:
Yes, there are reasons to decrease the GFhigh lower than 70%. Some peples need very, very low GF's ..

I usually use 25/60 on deep trimix-dives. The dives are only some minutes longer, but very save .. sometimes i have to do more deep dives a day.

@Olaf70: The GFhigh does not only affect the latest stop.
The GF's for the deeps between the GFLow(at bottom) and GFHigh(at surface) are linear interpolated depending on the depth. Because on that, all "flat-Stops" are affected by the GFHigh.

@forum:
I use the OSTC as Backup. Why should i use any computer for backup, when i must under water "recalulate" the calculation of my backup-computer by brain ????
In that case i use a table for Backup and a very cheep sport-diving computer in gauge-mode ( i did exact that for many years and decides to use a backup-computer).

I think, it is a dangerous possibility of the OSTC3, that its possibe to set GF values greather than 90 % :
100% is pure bühlmann and there ist no question, that with pure bühlman the normal diver has an significant chance to get an DCI. For that reason, the GF's where implemented in the bühlmann-algorythm.

The OSTC2 was an experimental platform for "specialists" : there we have many options to change. I think, OSTC3 is for standard consumer market:

In the consumer marked the OSTC3 alowes to dive "dangerous" GF's i.e. 110, but it's not possible to dive very safe parameters - thats the thing i don't understand.


regards
Koni

[Anonymous User]

There are many using GF high >100 or >110 without problems...

Jo

[heinrichsweikamp]

We though 70% is conservative enough but it's an easy fix to have 60% as the lowest setting for the gf high...

Regards,
Matthias

[heinrichsweikamp]

Here you go. GF_high can be between 60 and 110, aGF_high between 70 and 120.

Cheers,
Matthias

P.S.: Just in case: Do not use a GF>85% for diving. No matter if you have heard that people "survive" with GF_high=100% or 110%. "Surviving" a dive is only one goal of a decompression schedule...

[cyril]

I've tried to approximate OSTC3 deco calculations with V-Planner.
Given a 15min dive at 35m with air you get comparable results with GF 15/70. The OSTC result then is somewhere in between V-Planner with conservatism 2 and 3 (out of a total range of 0...5). This is a good medium of conservatism and not the highest rate. Therefore I think it's pretty good that we now have the possibility of a lower GF_high.

Thanks a lot for the update!

Regards,
cyril