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Bug: time is approx. 15s late after GPS time synchronization

Apparently there is a firmware bug present with GPS time synchronization.

Once time synchronization is performed, the watch will still show a significant delay of about 15s compared to radio controlled watches or NTP synchronized computers.

There seems to be a bug in the software routine to synchronize the watch time to the GPS standard.

Update: further research shows that the internal clock reference is only updated on date, hours and minutes while the seconds remain unchanged when synchronizing. This also applies to manual time setting via the menu option. Here the same behaviour can be observed, hour and minute is updated but the second count remains floating on its original timing.

Garmin should fix the synchronization routine so it would also reset the scound counter for the internal clock reference.

0 hogmemberisold over 5 years ago

I noticed a difference today after installing the 2.8 software update that the time was about 3 minutes slower than actual time (maybe that was the duration needed to update). I didn't try syncing it via GPS, but, connecting it to Express and forcing a manual sync (during the auto sync when connected to Express it didn't update the time) the time updated to within a second of my NTP synced laptop.

I do notice s few seconds of time difference after a GPS sync tho. You may be correct that it updates just hour and minutes leaving the seconds alone. Seems strange to go thru the steps and just get close...

0 HUMODDA over 5 years ago in reply to hogmemberisold

Yeah, I checked that with my Forerunner 935, there it works correctly and the seconds also get synchronized. Seems to me like an error in the program code, someone forgot to include the second counter during the synchronization. Should be easy to fix in a new firmware I guess

0 Steve.E over 5 years ago

I also notice the seconds are wrong

0 pgalbavy over 5 years ago

Mine is slow by about 3 seconds, less than those mentioned, but for a "watch" that's still huge.

0 HUMODDA over 5 years ago

Update:

This issue is now tracked with Garmin by the reference << Reference ID: 14843294K0 >> <Q#:1000705>

So far however, no feedback whether it is being looked into or even fixed in the next firmware release.

I would like to encourage anyone facing the same issue (I guess, it will affect most of the 945 owners) to write to Garmin support mentioning above reference and demanding a solution in order to give this request more momentum.

For the time being it seems a bit ridiculous to pay up to 750$ for a watch which is not even able to display the correct time.

0 tmk2 over 5 years ago

Similar issue discusses extensively on the F6 forum:

https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/fenix-6-series/171603/time-sync-off-by-7-seconds

0 f|33tStA over 5 years ago in reply to tmk2

similar issue on Edge 830:

https://forums.garmin.com/sports-fitness/cycling/f/edge-830/193552/edge-830-will-loose-time-with-no-gps/941985#941985

0 8671293 over 5 years ago

long press the power button for 30 seconds to see power goes off and power back ON keeping the device plugged to power supply : this solved it for me! :)