Mandatory Gas Time Alarm at beginning of the dive
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@Ldive Thanks for your response. It happened to me this morning again… Not a very good feeling getting this message at 33 Meters. I red somewhere in the Suunto POD manuals that LED Flashlights interfere with the tank POD. I had my two OrcaTorches with me to try them out for my upcoming holiday, Same config as I had my first Mandatory Gass Time message in the beginning of the dive. I also noticed switching back from my Compass view to the air screen that it took the Nautic several Seconds to display the Air Pressure in the screen 5 - 10 Seconds (Tank Pressure --, and Gas Time --) 2 to 3 times same behaviour. I have the strong feeling it has to do with my two new flashlights as one of them was also with me the first time this happened. I dived from there with my other flashlights (SEAC I50) where for several months nothing happened… This is just my feeling so I might bee completely wrong. .
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@hhouter The probe manual says that it transmits on a frequency of 123kHz, which does not really match the flicker frequency of a LED bulb.
It would be interesting to see what can emit in this frequency range on your configuration or what can sometimes cause obstacles… Unless you have a buddy with equipment that emits but sticks to you during the dive
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@Ldive Agree. But as it always happens in the beginning of the dive it might also be a pressure related issue with the POD, just see all the screen prints, it happens all the time descending. The only strange thing is that when I switched back from my compass screen the Nautic wasn’t able to show Air/Air Time for several seconds and then it picked-up. This is something i’ve never seen before.
To answer your remarks, LED flashlights work on a pulse modulation fequency swiching the LED on/off for full power or dimmed use, that is not the problem as this is only the bulb intensity emitting frequency.
The issue is that LED Driver electronics can emit signals generating Radio Frequency Interference (RFI) in the 20 - 100 Khz. So while the actual lights themselves don’t broadcast RFI signals, the internal electrical drivers and switching power supplies can generate high-frequency electromagnetic noise which can intefere with the signals transmitted by the Tank POD to the Nautic. This can intefere with the POD signals and frequency inteference can drop communication in the range of 50-90%.
This is what I saw happening onder water as the Nautic was not able to show Air and Air time for switching back and fourth from the compass screen.
I will do some testing to hope that I can reproduce this behaviour above water.
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I have been testing with 3 different LED flashlight on / near / close / up and down to the POD and the Nautic and the computer held its connection state as expected. So I do not expect that the RFI is causing the signal to become in-stable. Maybe a combination with POD pressure buildup in combination with RFI? I hope the Suunto dev teams can find the issue reading my POD and Nautic logs.
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@hhouter i have the same problem. Since yesterday my Nautic gave the gas alarm. Everything is oke but the alarm came at 4 meters deep after 2 min. Then after 30 min my ocean that i use as a backup did the same. But funny thing it reset it self and gas time went up again. Very strange. Send the info to Suunto.
Monday i will try again. Then is my next dive planned -
This morning same problem.
At 1.17 min depth 1.47 meters depth gas alarm.
I hope Suunto comes with a solution for this. -
@MartinPadiPro which flashlight(s) do you use. Has Suunto support asked to send over the logs from both?
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On top of all the other firmware issues the Nautic already has, I’m now dealing with this problem as well. This is becoming absolutely unacceptable.
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@l.sillsuunto Only did one diving ( sidemount with 2 x transmitters )
Neither the Nautic ou Nautic S gave me the Gas time alarm
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@Nandodiver Give it a few dives, all my budies have seen this alarm once or twice…You will get one also… It is something that needs to be fixed.
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@hhouter I use a metalsub flashlight
I send the logs to amilco Benelux and to Suunto.
They say to have a look. Friday I go diving again. Let’s see what is going to happen. -
@hhouter this needs to be fixed
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Yes, definitely a No-Go for a dive computer
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@MartinPadiPro Can you check the tank pressure in the app? Should be available as an overlay. It would be interesting if the pressure is reported wrong or the watch just went nuts
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@VoiGAS yes you can and I have checked… there is no dip in the pressure feed indicating a POD error. See first red notification at 33m, a gas time alarm. The pressure graph included. A good idea to overlay pressure a this doesn’t look like a POD issue but is leaning more to a sw bug calculating the mandatory gas time alarm at 5 min remaining in the tank
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@VoiGAS I checked it. Just when i got 195 stays there. It does not go crazy. I checked my gas time at the start that one is a bit nuts. 68 min then 4 5 6 7 back to 75. Normally i dive around 70 to 80 min with 200 bars 10 liters. But i hope Suunto comes with a update
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@MartinPadiPro @voigas Again I had the mandatory gas time alarm in the beginning of the dive. See included screenshots.
I had some initial issues getting the pressure on the display but that can be something that is non related… the tank was pressurized, i saw the pressure, but before my backroll I needed to check as pressure was “–”. But before he tank showed “201”. I’ve send the logs and an update of this case to Suunto support hoping they can find out what this causes. It is always during ascent and ofcourse correctly activated after a dive indicating the 5 Min alarm as is is supposed to do.
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@hhouter damn. I got a email from Suunto with standard answers. Check tank check pod i all did that. It is a wide problem under more Nautic users. Monday i go diving again if the problem is coming back i go send the data to Suunto and let you guys know
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MartinPadiPro said:
@hhouter damn. I got a email from Suunto with standard answers. Check tank check pod i all did that. It is a wide problem under more Nautic users. Monday i go diving again if the problem is coming back i go send the data to Suunto and let you guys know
Dear Martin,
Thank you for contacting Suunto Support and for sharing the detailed information about the issue you experienced during your dives.
We understand your concern, especially when the dive computer shows a low gas alarm despite having sufficient tank pressure. We will be happy to help you investigate this further.
When a Suunto dive computer triggers an unexpected low gas alarm or the Gas Time value resets despite having enough tank pressure, it is usually related to one of the following factors:
- Tank Size Configuration
Gas time is calculated dynamically based on your current depth, tank pressure, and breathing rate (Surface Air Consumption / SAC).
Please check:
Go to Gases > Edit Gas
Confirm that the Tank Size (Volume) is correctly configured
If the tank size is incorrect or missing, the gas time calculation may become inaccurate.
- Initial SAC Calculation Phase
During the first 5–10 minutes of a dive, the algorithm calculates your breathing rate. A higher breathing rate or sudden depth changes during descent may temporarily reduce the estimated gas time, which can trigger an alarm before the calculation stabilizes.
- Gas Time / Pressure Alarm Settings
Please verify your alarm settings:
Go to Dive Settings > Alarms
Check your configured pressure and remaining gas time alarm thresholds
The default mandatory tank pressure alarm is set to 50 bar, but custom alarm values may affect when notifications appear.
- Temporary Tank POD Signal Reconnection
If the wireless connection between the Tank POD and dive computer is interrupted temporarily, the pressure reading may briefly disappear and then update once the connection is restored. This recalculation can appear as a sudden reset of the Gas Time value.
Before your next dive, we recommend checking the following:
Connect both dive computers to the Suunto App and ensure they have the latest firmware installed.
Confirm the Tank POD is correctly paired and the pressure reading matches your mechanical pressure gauge before entering the water.
Ensure the Tank POD battery and connection are functioning correctly.
As a standard safety precaution, please continue relying on your mechanical pressure gauge if any wireless pressure readings appear inconsistent.
After your next dive, if the issue occurs again, please sync both devices with the Suunto App and provide us with:
Dive computer model(s)
Firmware version(s)
Approximate dive time when the alarm occurred
Any screenshots or dive logs available
We will review the information and assist you further.
Thank you for your cooperation.
Best regards,
Zack
Suunto Support Team -
https://photos.app.goo.gl/1o43GWsetjia3SfN9
https://photos.app.goo.gl/zhhZfuxBsEteLWo1A
This are mine screenshots
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