Dives Bug Nautic & Nautic S don't synchronize with the APP

[isazi]

@Nandodiver they have very similar duration. Were you recording with both devices at the same time or not? If yes, the app sees them as duplicates. If not, the issue is something else.

[Nandodiver]

@isazi

Yes, they being using at same time, same activity… how suunto “guess” that, because they look similar ?

In fact they have small diferences, whats the rule that Suunto apply for synchronize one and not the other ?

All the other 100 dives I have with both dive computer (at same time) then why that “rule” isn’t applied all the time ? I would save me time to synchronize twice…

Or Suunto expect everyone with 2 devices other more to have:
Two Suunto accounts
Login / Logout from smartphone app each time I have to synchronize ?
Login / Logout from computer app each time I have to synchronize ?
And if I bought a third device, create a Third account ??

[Nandodiver]

@isazi said:

@Nandodiver they have very similar duration. Were you recording with both devices at the same time or not? If yes, the app sees them as duplicates. If not, the issue is something else.

Nice try… but Its a know bug
https://forum.suunto.com/topic/11391/divelog-not-correctly-syncing-missing-dives/25

[isazi]

@Nandodiver nice try what?

[Nandodiver]

@isazi said:

@Nandodiver nice try what?

Your statement is not factual, and there isn’t any official reply from Suunto saying the same activity can’t sync from different devices to avoid duplication…also the manual don’t mention nothing about this topic…

What some users are reporting is that Watch - computers - smartphones need to be in same native language settings..

@hhouter said:

Ldive A lot of us have had problems with the app and bluetooth sync, Somehow it looks related to language settings on the Nautic and phone, i’m putting all in english and had problems with my phone when in Dutch. After setting all on english, sync works flawless. So make sure they match. Start sync and the app should give you a green checkmark almost instantly when the Nautic is near and switched on.

[Nandodiver]

So Ive create a second Suunto account (new email ) and synchronize the Nautic dives…

Nautic has 78 dives recorded… but only 28 show up Suunto APP

[Egika]

@Nandodiver said:

@isazi said:

@Nandodiver nice try what?

Your statement is not factual, and there isn’t any official reply from Suunto saying the same activity can’t sync from different devices to avoid duplication…also the manual don’t mention nothing about this topic…

What some users are reporting is that Watch - computers - smartphones need to be in same native language settings..

@hhouter said:

Ldive A lot of us have had problems with the app and bluetooth sync, Somehow it looks related to language settings on the Nautic and phone, i’m putting all in english and had problems with my phone when in Dutch. After setting all on english, sync works flawless. So make sure they match. Start sync and the app should give you a green checkmark almost instantly when the Nautic is near and switched on.

Isazis statements are factual. He has insights you don’t have and is trying to help with his knowledge.
That the same activity recorded with two watches if started and ended with a few seconds don’t sync both is true and known. No idea though if this applies to your observations.
It would be helpful to not put this aside, even if in the end it might be something else here.

While there might be this language thing, in your own words “is there an official reply from Suunto stating that this is the real reason”?

[Egika]

@Nandodiver said:

So Ive create a second Suunto account (new email ) and synchronize the Nautic dives…

Nautic has 78 dives recorded… but only 28 show up Suunto APP

Not sure with the Nautic device, but with Suunto’s sport watches there are two reasons for this behavior:
a) older activities can be overwritten by newer ones after a long time
b) more likely: A firmware update deletes the activity details and only a summary stays in the watch. It then cannot sync anymore.

[Nandodiver]

@Egika said:

@Nandodiver said:

@isazi said:

@Nandodiver nice try what?

Your statement is not factual, and there isn’t any official reply from Suunto saying the same activity can’t sync from different devices to avoid duplication…also the manual don’t mention nothing about this topic…

What some users are reporting is that Watch - computers - smartphones need to be in same native language settings..

@hhouter said:

Ldive A lot of us have had problems with the app and bluetooth sync, Somehow it looks related to language settings on the Nautic and phone, i’m putting all in english and had problems with my phone when in Dutch. After setting all on english, sync works flawless. So make sure they match. Start sync and the app should give you a green checkmark almost instantly when the Nautic is near and switched on.

Isazis statements are factual. He has insights you don’t have and is trying to help with his knowledge.
That the same activity recorded with two watches if started and ended with a few seconds don’t sync both is true and known. No idea though if this applies to your observations.
It would be helpful to not put this aside, even if in the end it might be something else here.

While there might be this language thing, in your own words “is there an official reply from Suunto stating that this is the real reason”?

Do you see this print below… its all the diving activities I done in 2026 since I have Nautic & Nautic S… that’s 78 dives/activities using both computers at same time

Yes there are 1 or 2 seconds apart in some dives
Yes there aren’t 1 or 2 seconds apart in some dives
Yes there are Missing dives Sync in Nautic S
Yes there are Missing Dives Sync in Nautic

Its a random thing… And I would like that someone Explain me WHY or WHAT CRITERIA that some dives aren’t sync and the others sync ???

ISSUE : Dive don’t sync
CAUSE: repetitive activity due similar data

ISSUE: Almost all Dive Sync and they have similar date
CAUSE repetitive activity are syncing with similar data

Observation: whats the criteria from this behavior
Observation why Suunto APP are syncing repetitive activity with similar data 72 times and not 78 times
Question Why Suunto only sync 28 Dives out of 78 in Nautic in new account ??
Question : How many dives can I do in Nautic without pairing and don’t lose data ??
Question How many dives can I do in Nautic S without pairing and don’t lose data ??

Is it too much to ask ??

[Egika]

@Nandodiver you can ask whatever you want.
Still please be awayre, that this is a user forum, not official Suunto support.
While many users here do have quite some knowledge and can answer many questions, the user base of Nautic dive computers here is pretty small.

The answers you received so far are the common knwoledge (and are factual):
I summarize again:

• activities recorded with two sport watches at the same time: only one will sync.
  No idea if this applies to Nautics as well.
• at some point old activities in the log can be overwritten (less likely nowadays since there is big memory in the watches that is used for some years to store activity logs)
  Again no idea, if and to what extent this applies to Nautic
• Activities loose their details and will not sync anymore after an update of the watch firmware.

I hope that there is someone who has more detailed knowledge about the specific questions you asked. But I think they are too special for the users here.

[Nandodiver]

Diving only

Nautic S / Nautic / Ocean
(10s intervals) 6 depth samples per minute

Teric (latest firmware add option for 5s and 2s )
Default (10s intervals) 6 depth samples per minute
Optional (5s intervals) 12 depth samples per minute
Optional (2s intervals) 30 depth samples per minute

Garmin MK1/ MK2
Smart (10s intervals) 6 depth samples per minute
Every second (1s intervals) 60 depth samples per minute

AI resume about issue with longer Depth Samples

Longer depth sampling intervals (such as 10-second, 30-second, or 1-minute intervals) can cause noticeable issues with data fidelity, dive log synchronization, and third-party software compatibility.

The Issue: Rapid ascents, descents, safety stops, or bouncing along a wreck/reef get flattened out. If you bounce between 15 meters and 18 meters over 10 seconds, a 10s or 30s interval might completely miss the peak depth or smooth out a fast ascent rate.

The Issue: The exported log may not store every single algorithmic recalculation. When third-party software re-simulates the dive profile using the sparser depth samples, the calculated NDL (No-Decompression Limit) or ceiling profiles can diverge from what the watch actually displayed underwater.

The Issue: If a download is interrupted or resumed (like the buffer-resume logic discussed in libdc-swift), mismatched sample counts or varying interval densities can sometimes cause sync tools to miscalculate progress percentages or flag the log structure as unexpected, requiring a full re-download

[Nandodiver]

@Egika said:

@Nandodiver you can ask whatever you want.
Still please be awayre, that this is a user forum, not official Suunto support.
While many users here do have quite some knowledge and can answer many questions, the user base of Nautic dive computers here is pretty small.

The answers you received so far are the common knwoledge (and are factual):
I summarize again:

• activities recorded with two sport watches at the same time: only one will sync.
  No idea if this applies to Nautics as well.
• at some point old activities in the log can be overwritten (less likely nowadays since there is big memory in the watches that is used for some years to store activity logs)
  Again no idea, if and to what extent this applies to Nautic
• Activities loose their details and will not sync anymore after an update of the watch firmware.

I hope that there is someone who has more detailed knowledge about the specific questions you asked. But I think they are too special for the users here.

Why not give the option to end user to select their Depth Sample rate intervals to 1second ??? This is only a matter of Firmware upgrade on Suunto Side…

If they can put 1s depth sample intervals on freedive mode, im sure will work in scuba option…

Difference from 10s to 1s depth sample intervals

• Draws more battery (its a diving watch, Nautic uses 40% battery in 20 dives )
• larger data file ( all of them has 32gb internal memory )
• Sync will take longer over bluetooth (at least would be accurate sync)
• store less dives data ( 10s depth sample gets+400 dives, 1s get 40 dives)

In the end of the day its an end user option, but at least would solve this mismatch data of air consumption between Dive computers and unable to sync dives…