Mandatory Gas Time Alarm at beginning of the dive

[Nandodiver]

date of arrival 15 july 2026

First 2 digits (YY): Year of manufacture
Next 2 digits (WW): Week of the year the device was made.
Remaining digits: Unique factory production numbers

Transmitter Model DP142
Serial 2625xxxxxxx
Serial 2625xxxxxxx

Nautic DW251
software 2.49.32
bluetooth 3.0.50
serial 2553xxxxxxxx

Nautic S DW253
software 2.54.12
bluetooth 3.0.54
Serial 2604xxxxxxxx

[hhouter]

@Nandodiver that might be an option but why is my EON Core on the same POD and same dive where the Nautic logs the alarm not giving any comparable errors? My expectation is that the errors are in the Nautic.

[Nandodiver]

@hhouter do you have the problem in :

Sunnto Tank POD (new version)

Or the

Suunto wireless tank pressure transmitter (old version)

[hhouter]

@Nandodiver I have the tank POD, i believe the transmitter only works with the older computers like Vyper and the D Range of dive watches.
I bought the POD in the beginning of this year and i’m not aware that there is a new version available.

[Nandodiver]

This morning i had 2 x Mandatory gas alarm with both dive computers connect to the same transmitter and completely diferent times

1x Nautic (right arm) (battery 45% )
1x Nautica S (left arm) (battery 18% )
1x transmitter on right side (backmount)

and from my findings i believe is related with bad communication between transmitter and dive computer

Ps: its the first time im using the configuration single gas tank, my normal configuration is multiple gas (even if both tanks are air ) Could be related or not with the alert/bad communication.

pps: this was the dive i had most dropouts (no idea why)

NAUTIC S

Mandatory gas alarm 7m26s
Air consumption 100L/Minute 7m31s
Dropouts time on Nautic S 8m41s + 9m.28s + 26m49s + 27m21s + 29.26s

Theres was some Dropouts that i didn’t record, not sure if was at same time has the Mandatoy gas alarm

NAUTIC

Mandatoy gas alarm 26m28s
Air consumption 100L/Minute 26m28s
Dropouts time on Nautic 9m19s + 26m43s + 27m20s + 29m24s.

[Nandodiver]

More prints

[Nandodiver]

more prints

[Nandodiver]

Here the Nautic S had dropout and i move the arm closer to the transmitter to re-connect

[Nandodiver]

here Nautic & Nautical S had dropout at same time, and i was able to check the air consumption in Nautic

[Nandodiver]

Another dropout Nautic & Nautical S

[Nandodiver]

The following air consumption is not making sense on the Nautic S
Tank 12 L x 197 bar = 2364 bar

start 197 Bar
end 43 Bar
154 Bar x 12L =1848
2.70 ATM x 44 minutes = 118

1848L / 118 =15,6L minute

[hhouter]

@Nandodiver This is why I think, the POD does not have anything to do with it, somewhere in the Ventilation and GasTime calculation as seen by @mikenizm something goes crazy, it is corrected after some time but this is a serious issue to be solved asap!!!

[Nandodiver]

@hhouter the air consumption is definitely a bug (starting new topic about it)

[hhouter]

@Nandodiver Correct, but might also be related to the Ventilation issue…

[l.sillsuunto]

Since Suunto still shows no meaningful response and reports of Nautic issues keep piling up, I have now reported the Nautic through the European product safety system as a potentially dangerous product.

Given the false mandatory gas-time alarms and other incorrect dive data, I think an independent safety review is overdue.

I’ll keep you updated.

[jozzz999]

@hhouter I had the same issue this morning on my Ocean. Freaked me out a bit. I was 17.5m down, shortly after starting the dive. Interestingly looking at my gas consumption graph in the app, it spiked through the roof momentarily when the Mandatory Gas Time alarm fired. Definitely a bug

[Nandodiver]

Since my latest findings, im starting to get a conclusion based on what I’ve observed (some of you might not be on the same opinion)

Nautic - No dropouts > No issues (air consumption or alerts)
Nautic - With dropouts > issues air consumption & alerts

Nautic S - No dropouts (sidemount ) NO ISSUES watch & transmitter are close by
Nautic S - with dropouts (backmount ) ISSUES since the watch is opposite side of transmitter

[Nandodiver]

So did 2 dives this morning (maximum depth 11m)

Nautic - new firmware 2.55.46
Nautic S - 2.54.12
transmiter on Right Side

Air consumption seems to be correct in Nautic & Nautic S

1st dive Nautic S had no dropouts or alerts (Left arm)
1st dive Nautic no droputs or alerts (right arm)

2st dive Nautic S no dropouts or alerts ( right arm)
2st dive Nautic no dropouts or alerts (right arm)

In more and more convinced the issues some people have are due transmitter bad connection with their computer, and is more noticeable at great depths

[Nandodiver]

One more dive without dropouts and the Time gas alarm is nowhere to be seen

My findings and observations for that Time gas alarm at beginning of the dive is due the dropouts and bad connection between dive computer and the transmitter…

Doing sidemount never had issues or bugs, with backmount i use both computers on the same wrist…

Even the air consumption was very similar in Nautic /Nautic S

[Nandodiver]

This tips comes from several dive computers manufactures to avoid Dropouts…

When a dive light causes a wireless tank transmitter to drop its signal or fail underwater, it is usually due to electromagnetic interference (EMI) or radio frequency interference (RFI) emitted by the light’s internal LED driver circuit, or a shared power drop if batteries are critically low.

TIPS

Increase Distance: Keep your primary dive light mounted on your Goodman handle or hand, well away from the tank transmitter on your first stage or the computer on your wrist.

Check Batteries: Swap or fully charge the batteries in both the dive light and the transmitter. Low voltage changes the operating frequency and output power of electronic circuits, making them much more susceptible to noise and drops.

Use a HP Hose Extension: Move the transmitter off the direct port of the first stage using a short high-pressure hose extension. This clears physical and electronic blind spots.

Upgrade Gear: Switch to a high-quality, name-brand dive light with certified electromagnetic compatibility (EMC) shielding, or service/replace an aging transmitter.

My dive lights usually are:
2x Divevolk LS50 ( video lights mounted on Gopro) away from transmitter.
1x Wurkkos LS05 ( torch bolt snap attached to Nautic Bungee cord)
1x Prozhaozhu ( strobe beacon bolt snap attached to Nautic Bungee cord)

Curious: coincidence or not, when i stop using cheap TDS DZENOT backup light the dropouts stop