CRITICAL BUG NAUTIC & NAUTIC S

[Nandodiver]

Found some serious bug in Nautic & Nautic S computers (report to suunto moments ago)

Nautic S log dive SOFTWARE 2.54.12
Multi tank configuration
Air 12L + transmitter n: 1
NX31 5.7L + transmitter n:2

Nautic log dive SOFTWARE 2.55.12
Multi tank configuration
Air 12L + transmitter n: 1
NX31 5.7L + transmitter n:2

FACTS : First and second dive

The tank NX31 was closed all the time during the dive
The tank NX31 gas was not used during any dive
Ive received alerts to switch gas during the dive but ignore it, I DIDNT PRESS ANY BUTTON, or SWITCH GAS…

Both NDL & TTS show me bottom time like i was using AIR (and i was)
Check tank 5.7 L & regulator post-dive and the tank is intact with 220BAR NX31.

Im divemaster with +400 dives on my belt, it was not diver error (im 100% sure) the other dive buddies they are also on AIR, and bottom time and safety stop was done together with similar safety stop time.

This is critical bug, the gas switch recommended intervene in some point at software and computer level.

[Dimitrios Kanellopoulos]

@Nandodiver So this is the reply from another diver that works on Suunto ( am not so good with diving tech so just transfering whats going on)

Not a critical bug, but this sounds like some not correct configuration

1. If you have the gas enabled (in this case NX31) the algorithm will assume you are carrying the gas with you and planning to dive with it. It will there for suggest a gas change when a better gas is available (all dive computers do this). This is clearly mentioned in the manual (p 34). So in this case the diver has NX31 with him (looking at the size it is most likely a “pony bottle”) , the algorithm can not know if he is planning to use it or not. If it is enabled it will be taken into consideration in the decompression calculations and suggesting to switch to it.

2. The pressure drop can e.g. be explained if the diver has turned on the tank before dive (to check pressure) then turned it of and then during the dive partly purged the second stage at 2 different times.

We tested the same scenario and no pressure drop is happening

If you dont want the gas switch notifications, the gas should be disabled (or dive in single gas)

[Nandodiver]

@Dimitrios-Kanellopoulos

1- Im not bother with suggestions to change Gas (its the algorithm doing their job)

What is critical is :
2- Pony bottle gas (5.7L) was check pre-dive and closed, and during the dive remains close, and there was no purged at all during the dive.

Just to make sure that we are on same page :

The Nautic & Nautic S dont display any gas switch during the dive by the diver otherwise the Suunto software would show the gas switch on the map (i think we are we clear on this)

But the decoded log show multiple gas switch, but they never happen.

Independent of any configuration, if a gas tank is closed and not used during the dive, it shouldn’t show any gas consumption.

I have analog manometers along with the transmitters, and with tank close the manometers dont move…

Saying this is not critical bug is just non-sense…

[Nandodiver]

@dimitrios-kanellopoulos

Ive send a dropbox link to suunto support with all relevant information and logs…

Can you share this specific configuration to that diver that work on suunto so that they can replicate it ?

The Before configuration was used to this dives

Nautic & Nautic S have the exact same settings…

[Nandodiver]

NAUTIC

This was a dive before the issue reported on this topic…

Its visible the gas switch on the map made by the diver ( Nautic & Nautic S)

Same transmitters, same tank 12L + 5.7L , but still the initial gas display on 5.7L is wrong…

The diference on this dive to the previous dives is that this one has tank 5.7L with NX26, so didnt have any gas suggestion popping up…

[Nandodiver]

same dive, but with NAUTIC S (exactly same issues )

Gas switch OK
Initial gas pressure on that transmitter display wrong

[Lena_dive]

@Nandodiver Looks like you have 2 gases, both AIR. Which one is the 5.7L that you didn’t use? Is it the one with starting pressure 9 bar?

and the one with 201 bar and 18,3 consumption is your main 12l that you actually using and the data for this one is correct right?

You are referring to NX26 but the list says both are AIR?

The start pressure of 9 bar sounds like you have opened the tank then closed it (before the dive) and the computer has gotten the start pressure of the purged tank. The end pressure of 109 bar - is this the pressure you have in the tank? did you open the tank before the dive ended (before the dive summary?) For me this sounds like you are describing it, you check tank - open and close it- the computers gets the info even if not in use because it is synced to device. To avoid this open and close (to ensure your pod is linked) and make sure no pressure is left in 2nd stage.

[Nandodiver]

@Lena_dive ive re-check the dive from 06/09 and was indeed air + air
5.7L is always air or nitrox (transmitter ending in 18)

Regarding the -9… if i switch air + air, obviously ive open the 5.7L tank… the computer should have read the correct pressure…it didnt…

Both tanks 12L + 5.7L are checked & tested before the dive, closed, taken to the boat, open before jumping on the water… but the main issue is not the -9 readings, the issue is gas consumption of closed tank…

i only publish that dive 06/09 to show that when theres a gas switch the computer/software mark dot on the map… it was not case with 07/09 dives…

Both Nautic & Nautic S has same -9 reading

air + nx26 was the dive on 05/06