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Wrong time and date after GPS sync!

Former Member
Former Member

So this one is a weird issue that few people seem to have. Got a new Instinct Solar Surf edition. Right off the bat, when syncing time with GPS, got the wrong time, date and sunset/sunrise, moorise/moonrise data. Time is set to auto, am in an area with excellent GPS connectivity. When I go outside, start an activity or simply set time  to sync with GPS, I get a weird time for a time zone that is UTC+12.45 and a date that is 48 days in the future (the watch thinks it's Oct. 17 2020!).

Did quite a bit of troubleshooting but no luck: 1. verified am getting a good GPS lock. 2. checked that the GPS coordinates provided by the satellite are OK (my exact location according to other GPS readings + Google Earth). Tried many times - day, night, changing location and even during a 2 h surf session (watch had wrong time and date after more than 2 h of soaking GPS signal with 5 GPS bars showing!). Of course, am running the latest version of the software...etc. through Garmin Connect + also tried multiple resets.

I even tought the watch was a faulty one, so got a new replacement one from the vendor. Still the exact same issue!

So basically, the watch only shows the correct time and date when synced with the phone (am 100% sure of that because I played with the time setting on my phone and the watch displays the phone's changed time when it syncs...). Quite frustrating as I bought the watch to get tide, sunrise, sunset data and moon phase data for surfing but all I have now is a watch that needs to be connected to a phone to show the exact time! For $450, quite a bummer...

Anyways, just trying to see whether someone can help:

1. Is it normal that the watch syncs the time with the phone? Am wondering whether this is not creating confusion within the software. Garmin support on the phone told me the watch syncs time with GPS only not the phone but I have ascertained with 100% certainty it reads the time from the phone (cf. above).

2. What could possibly explain a wrong display of time/date after a successful GPS sync and GPS indicating the correct position? It can't be an issue with the GPS signal - I checked 10 times and I have about 21 satellites overhead (GPS + Glonass), most of them with excellent signal (used a separate phone app to validate that), and am in suburban area with very few obstructions.

3. I saw on the forum that another user had the exact same issue, and surprise surprise, in Morocco as well!

Am not sure how the GPS sync. is implemented in the Instinct Solar. But if I had to guess, the GPS module is probably decoding the GPS signal properly (hard to see how it could not). So could this be an issue with the GPS module getting the proper GPS UTC time from the satellites but then failing to identify the right timezone and by default showing some totally improbable time and date as a result? Where does the Instinct watch look up the proper timezone it should pick up - is this done in  the watch itself based on position (in which case, there could be some coding error) or is this done through the phone where the Instinct Solar attempts to read from the phone what the right time zone is (and possibly try to fetch the date from an incomplete database or failing to read properly from the phone)?

At this stage, am guessing that probably the watch reads the UTC time from the GPS, then attempts to find the right timezone am at (UTC + 1) either in the internals of the watch or through the phone, does not find it and then simply displays a random time and date by default?

Any enlightened views on this? Would immensely help as am not sure when I can leave Morocco (plus, surfing season starting so might as well stay a bit more).

Thanks! Nico.

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Nope. Right after the sync., the GPS time is wrong.

    Yes, prepared to do anything to get this sorted out :-) If not massively complicated - am an engineer (so like troubleshooting!) so reasonably okay with tech. but not an IT genius :-)

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Former Member

    Slight smile

    just changing the version in garmindevice.xml

    turn off garmin express

    connect your watch to the computer

    • being it an mtp protocol device you have to copy and edit garmindevice.xml on your computer
    • use a none disruptive editor ! like notepad on windows
    • find the major 24 and change the 24 into 2 (see older post)
    • copy the edited file back in your GARMIN folder on the watch
    • backup and remove the gmaptz.img file from your watch

    start garmin express

    let it or make it sync

    check the watch for a new gmaptz.img file

    disconnect the watch and check

    happy & safe sporting

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Former Member

    could also be something wrong with the checksum file for gmaptz.img

    I'll post two gmaptz.img files, version 22 and version 24 which you can try to use

    version 22 gmaptz-version-22.zip

    version 24 gmaptz-version-24.zip

    happy & safe sporting

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Cool! Thanks a ton! One issue I have: I can't find any gmaptz.img file in my watch when connected to the computer (the xml file, yes but not the .img file). Is that normal?

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Former Member

    according your previous screenshot it should be in the GARMIN folder

    • with your watch it could be possible it is removed after import !
    • geuss it is not removed on devices with map capabilities

    or this is the cause of the fault !

    and you can skip that line....

    happy & safe sporting

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Aha...That could indeed be the issue! Let me try to force it to acquire a new one then and see. Will edit the xml file now.

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Former Member

    version 23 gmaptz-version-23.zip

    happy & safe sporting

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Thanks! Just in case, the .img file goes where normally in the Garmin directory? Just in the main root directory (Garmin) or in a sub-folder? Cheers AND you rock! Thanks so much for the help!

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Former Member

    Thanks so much for the help!

     just trying to help, no more Wink

    your screenshot shows GARMIN folder

    put in in the garmin folder and disconnect from computer

    happy & safe sporting

  • Former Member
    0 Former Member over 5 years ago in reply to Former Member

    Former Member

    editing the garmindevice.xml is only to trigger outside software to release the files again

    the watch recreates the garmindevice.xml file every time the watch is connected to a computer

    just as it does with device.fit and some other fit files...

    see it as an interface between watch internals to the outside world

    happy & safe sporting