Nuvi 40LM Time incorrect

 

Hi,
I bought a used Nuvi 40 and for some reason the time is always off by 1 hour when I select "Automatic" in the time selection icon. I can manually set it to the correct time but the automatic function is not working. I have good sat signal so that is not the issue. I sent a note to Garmin support and they did not have any solutions for me. Anyone else run into this issue. I am thinking maybe a firmware issue but not sure. Any help is appreciated. Thanks, Dave

WebUpdater

Connect device to computer and run WebUpdater and check for any updates dealing with time zones etc. https://www8.garmin.com/support/collection.jsp?product=999-9...

you can also use Garmin Express to check for updates. https://software.garmin.com/en-US/express-download.html

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Charlie. Nuvi 265 WT and Nuvi 2597 LMT. Android Here WeGo - Offline Maps & GPS.

Can't recall

But do we/did we ever set a home location on Garmin?

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Nuvi 2460LMT.

Solution might be at this link

Read through the comments of someone else with a similar issue at https://menga.net/gps/1hour. There is also a link referenced that takes you back to POI, see http://www.poi-factory.com/node/44688

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John from PA

home location

pwohlrab wrote:

But do we/did we ever set a home location on Garmin?

For the initial setup, I think we chose a home or time zone location, but the GPS knows its location and should display the correct time. There have been time zone updates, so a firmware update is the first thing to do.

dobs108 smile

Good Point On Home Location

pwohlrab wrote:

But do we/did we ever set a home location on Garmin?

I was thinking the same thing.
Member dave520 stated "I bought a used Nuvi 40".

Reset Links for Garmin 40
https://www.youtube.com/watch?v=mujdSP-fM98
https://www.youtube.com/watch?v=SN7SzOyBJ3M

Edited I posted the same time as dobs108.

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Nuvi 2460LMT 2 Units

Date correct?

Does the nuvi 40 show the correct date, including the year 2021?

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Standard time/daylight time setting??

Standard time/daylight time setting??

ding! ding! ding!

We may have a winner!

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it's the dog's fault

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Garmin nuvi 2455 - nuvi 350, 260 (spares) - my other toys: IMac quad-core i3, Mac Mini, MacOS: Mojave 10.14.6/Catalina 10.15.7. and introducing The Beast, a 2013 Dodge Charger Pursuit and his Garmin DriveSmart 5. The dog's name is Ginger.

Thanks

I did do a couple of resets and that did not work.
Will take a look at the files in the system folder as suggested.

Thanks everyone!

Dave

Tried but no luck!

So I tried a few different things.
I tried another reset and that did not work.
I went into the system folder and found the .bin files and renamed them and rebooted the unit. When I did that it was like I did a reset and asked me for country and language. Unit is still 1 hour off. I also tried using web-updater and reinstalled software version 4.0 hoping that would help. It did not. I also tried deleting and reinstalling the time zone file and that did not work. Not sure I want to but maybe a reinstall of the firmware but that may be risky. Anyone know how to reinstall firmware and where I would get that? I also noticed another issue that was mentioned where the automatic night and daytime function is not working either.
Thanks for the help everyone!!
Dave

another idea

The nuvi has fixed its position using the satellites, but maybe the time signal takes longer. Especially because the nuvi was just purchased, it needs satellite almanac data. This takes time to download, and maybe the time signal is part of that.

The time setting should be set to auto. Make sure the GPS is fully charged, turn it on, and put it down in a wide-open area where it can see the most satellites. Leave it alone for at least 20 minutes. It will download satellite almanac data.

This just might fix the time problem.

dobs108 smile

Similar thoughts

dobs108 wrote:

The nuvi has fixed its position using the satellites, but maybe the time signal takes longer. Especially because the nuvi was just purchased, it needs satellite almanac data. This takes time to download, and maybe the time signal is part of that.

The time setting should be set to auto. Make sure the GPS is fully charged, turn it on, and put it down in a wide-open area where it can see the most satellites. Leave it alone for at least 20 minutes. It will download satellite almanac data.

This just might fix the time problem.

dobs108 smile

I had similar thoughts on this since the question seems to arise with purchases of used devices.

Before panicking, I would do the following with any GPS that either was just purchased, used or new, or a GPS that was powered down and moved several hundred miles and restarted, or a GPS that hasn't been used for more than a month: using the cigarette lighter adapter in a vehicle in a clear area, power up the GPS and stay stationary until it has a full bevy of satellites detected, then drive around for a good half hour or longer. The benefits will be that at the end of this, the GPS will have an adequate charge and will have stored the full almanac with the hope that some of the discrepancies noticed will automagically resolve themselves with no user input needed. Note that the Time Signal is part of the almanac:

https://en.wikipedia.org/wiki/GPS_signals

To the OP: if you haven't taken your "1-hr off" on a drive like this and only tested it at home, maybe give this a thought.

I will try driving around

I will try driving around with it over the weekend and see what happens. I bought the Nuvi 40 as I thought it had similar features to my 1300 that I also have. While the maps on the 40 are better then the 1300, the 1300 seems to out perform in other areas. My fault for not doing my homework on the difference between the 2 models. Luckily I did not pay a lot for the 40 so maybe I will give it to a friend or relative. Thank you all for help!! I really appreciate it!
Dave

GPS Date Rollover?

I had asked earlier if your device showed the correct date (which wasn't answered). After looking at the user manual for the nuvi 40 there is no mention of the current date showing anywhere on this model. Is that true?

I am wondering if this model might be one that was affected by the GPS date rollover issue that occurred on April 6, 2019. Certain GPS chipsets were affected causing the GPS to calculate an incorrect date after April 6 2019. That of course could cause the DST to not match the current calendar. Garmin provided firmware fixes for some affected devices, but not all.

This is a WAG as I have not heard of Garmin devices as new as the nuvi 40 being affected. If a chipset update is available for your unit, Garmin Express should have found it. But it may be worth doing a little more research on the nuvi 40 to see what GPS chipset it uses and whether that chipset was affected by the rollover.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Long shot

I'm hard pressed to believe this might work, but since you are grasping at straws I'll present it. It was sourced from some forum where someone had a date/time issue but not with the 40LM.

"With the unit fully charged, take the unit indoors, as far away from windows, etc. as possible, perhaps a basement. Turn it on, and after it boots, tell it you want to go to one of your favorites, preferably one nearby. The unit should say, "Acquiring Satellites" for some time, then tell you, "Unable to locate satellites. Are you indoors?" Press NO. It will then ask you, "Are you in (your state)?" Press YES. It will ask, "Is today (whatever date it thinks it is)?" Press NO. The unit should then allow you to set the correct date and time depending on model. Once that is done back out to the main screen. POWER DOWN completely, not standby or sleep. Take the unit outdoors and POWER UP. Ideally have it plugged into a live socket in a car as reacquiring satellites and downloading the ephemeral data can take up to an hour."

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John from PA

GPS Date Rollover?

I do not see the date anywhere on this unit.
But thanks for the reply.

Long Shot

John from PA wrote:

I'm hard pressed to believe this might work, but since you are grasping at straws I'll present it. It was sourced from some forum where someone had a date/time issue but not with the 40LM.

"With the unit fully charged, take the unit indoors, as far away from windows, etc. as possible, perhaps a basement. Turn it on, and after it boots, tell it you want to go to one of your favorites, preferably one nearby. The unit should say, "Acquiring Satellites" for some time, then tell you, "Unable to locate satellites. Are you indoors?" Press NO. It will then ask you, "Are you in (your state)?" Press YES. It will ask, "Is today (whatever date it thinks it is)?" Press NO. The unit should then allow you to set the correct date and time depending on model. Once that is done back out to the main screen. POWER DOWN completely, not standby or sleep. Take the unit outdoors and POWER UP. Ideally have it plugged into a live socket in a car as reacquiring satellites and downloading the ephemeral data can take up to an hour."

You might be onto something as maybe the unit thinks it is in the Central time zone! I am in the Eastern time zone. I will try this. I have nothing to lose! Thanks

Update!
Need to find an underground parking garage as my basement still gets a Sat signal. I also took another chance on a ebay listing for a 2597 that was listed for parts @ 7.95 I got it and all it appears to need is a battery which is now on order along with a data card and a mount.
Thanks,
Dave

Try a "Faraday" cage

A couple of things to try to block the signal...try a bathroom or powder room that is internal to the house. And a Faraday cage should work...a Faraday cage is any metal container, an empty paint can, a coffee canister...use your imagination. You could probably wrap the GPS in heavy duty aluminum foil to forma decent cage. It is named after Michael Faraday, see https://en.wikipedia.org/wiki/Faraday_cage

By the way it is very easy for a car thief to duplicate the signals of a car remote, open the car and start the car. That is why some sites suggest putting your remote in the refrigerator. I don't do that because it kills the remote batteries but I do have a small coffee canister just inside my front door. See https://www.popularmechanics.com/technology/security/a298359...

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John from PA

Faraday cage

I'm glad I don't live, work, or travel, where I have to be that paranoid.

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I never get lost, but I do explore new territory every now and then.

Agree, but

KenSny wrote:

I'm glad I don't live, work, or travel, where I have to be that paranoid.

I agree, but in the inner cities they are seeing more and more car theft or just breaking into vehicles for anything left behind (including a GPS). It is also happening at shopping malls and restaurants where gangs of thieves are reasonably assured you will be away from your vehicle for an extended period.

Keep in mind that when your car remote is cloned and then somone gets in using the clone, the alarm does not go off.

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John from PA

Checking for correct current date on nuvi 40

Here is a method that should work on your nuvi 40 to determine if it is calculating the correct date from the ephemeral data received from the satellites. Doing this should either prove or disprove that your time problem is being caused by the 2019 date rollover issue. If this method shows a correct current date, then your GPS chipset has the updated firmware to correct the 2019 date rollover issue.

Here are the steps to check the calculated date:

1) Make sure trip logging is turned on (see http://www.poi-factory.com/node/44491)
2) Turn the nuvi on, let it acquire a good satellite fix, then take a short trip with it. This can be anything ... a short drive or even a short walk on the sidewalk.
3) Connect the nuvi to your computer in mass storage mode.
4) Find the file Current.GPX in the GPX folder in internal storage. The GPX folder may be at the root level or inside the Garmin folder.
5) Open Current.GPX with Windows Wordpad. You can also use Notepad, but it formats better in Wordpad. If you have a Mac instead of Windows, open Current.GPX in whatever plain text reader you use on your Mac.
6) Search for the tag Active Log. This will take you to the beginning of the trip log. Scroll down to the bottom of the file to see the newest dates. As you scan through the trackpoint data, you will see <time> tags which are followed by date and time values.

Note: If you use Garmin's Basecamp program, you can just look at the recorded Trip Log in BaseCamp, rather than opening file Current.GPX in a text reader.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Checking For Correct Current Date On Nuvi 40

The file has a date of 2001 does not appear that logging is happening. I went to link you gave me and hit SHOW but nothing updated in the file. I renamed the file and rebooted the nuvi and it created the same file with a 2001 date.

Thanks
DAve

File date.

You should look at the data in the file using a text reader like Wordpad, not the file date. You also need to follow the instructions I gave and use the nuvi on a short trip to make sure current (new) entries have been added to the trip log.

That said, I am surprised that Current.GPX has a file date of 2001 and that is not a good sign. If the problem is an outdated firmware on the GPS chipset, the date after the 2019 rollover would have been 1999 if I remember correctly, so showing 2001 in 2021 would fit that scenario. And it was not an exact 20 year rollback ...it was 20 years plus some additional odd months and days. So if that is your problem, it makes the month and day of the month wrong as well as the year. That is why the device might not "know" we are in the time of year where DST is in effect.

This may be correctable and may be worth a call to Garmin support. I know Garmin provided chipset updates relating to the rollover for chipsets they classify as the M chipset and the M2 chipset, and possibly some others. I don't know if the old Garmin WebUpdater program still works, but it might be worth a try to see if it recognizes an update that Garmin Express doesn't. There used to be a firmware archive site called "Perry" that contained these firmware files for direct download instead of going through Garmin, but alas, that site has been taken down. And sadly, there is a possibility that Garmin never provided an update for your particular model/chipset.

I am now leaning toward the possibility that this is the problem causing your incorrect time issue. In fact, the more I think about this, the nuvi 40 wasn't introduced until 2011, so it seems unlikely that any of the files should have dates as old as 2001.

(As a side note ... I would be interested in having sussamb and our other Garmin experts weigh in on this to see if in their view my thinking is correct on this problem wink).

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Well

I'm in deepest France at the moment continuing the renovation of my French house but agree a date of 2001 is very odd and certainly supports your theory although I can't recall any other nuvi 40s having a similar issue.

Perry is still available via the wayback machine https://web.archive.org/web/20200106153456/http://www.gawisp... and the nuvi 40 is listed

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Where there's a will ... there's a way ... DriveSmart50LMT-D, Nuvi 2508LMT-D, 1490LMT, 1310, Montana 650T, Etrex 20

I'm wondering if GPSBabel would be of any help

I'm wondering if GPSBabel would be of any help, specifically the reset time option. (https://www.gpsbabel.org/index.html) It is described in the GPSBabel documentation as follows:

resettime option

Sync GPS time to computer time.

This option is experimental and was added to solve a very specific problem. Certain Garmin units (the original black and white Vista is known to have this) will sometimes scramble their clock crazy far into the future (like 2066). When this happens, the GPS itself may or may not work and later conversations with GPSBabel may fail as the time overflows the documented range. The use of resettime brings the GPS's internal clock back close enough to reality that the GPS itself can then "fix" it when it has next a lock.

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John from PA

Well

So I tried replacing the GCD file with one of the ones on the Wayback archive. I tried both the oldest one and the last one and neither one made a difference. I ran Webupdater and nothing for firmware showed up. Not sure I have the time to get Garmin on the phone to just fix the date issue. Everything else works fine. I cannot thank you all for the advice and help give. I really appreciate it.

Thanks,
Dave

chipset firmware needed, not nuvi software

Thanks to sussamb for pointing us to the Perry Archive!

Dave520, You need a file from the Perry folder named chipset_firmware, not the nuvi 40 sofware. The difficulty is trying to determine what chipset the nuvi 40 uses. I am guessing it is type M2 or type M5, but we need to know this for sure before you would attempt the firmware update, as applying the incorrect firmware could brick the device. There were firmware updates issued in 2019 for both the M2 and M5 chipsets, so I am guessing that was to correct the date rollover issue. So far I have been unsuccessful in Googling to find what GPS chipset the nuvi 40 uses. Does anyone happen to know how we can find out?

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Chipset Firmware Needed, Not Nuvi Software

If I opened it up would it be on the chip itself? I already changed the battery in it so not a problem opening it again if needed. Anywhere else to look. Maybe in a file somewhere.

Chipset version.

Sorry, but I don't know the answer to that question. Did you by any chance try the old Webupdater program. In certain situations, it has been able to find updates that Garmin Express doesn't offer. If you don't have a copy of the Webupdater program, it is available in the Perry Archive in the Garmin Utilities folder. I think version 2.54 is the one you want to download and install.

The other thing I will suggest is to call Garmin support next week and give them the full rundown of the symptoms including that the device is generating current date of 2001 and that is consistent with the date rollover problem that should have been corrected with a GPS chipset update. Don't be surprised if the first level tech doesn't know what you are talking about. You may need to be persistent about talking to a more experienced tech.

And as I said before, it is possible that Garmin never provided an update for the nuvi 40. There are some other devices that they never fixed for the rollover problem. It would be nice if we could find some other owners of a nuvi 40 to see if they have the same issue. I would guess that the 30, 40 and 50 models all use the same chipset and they would all experience the problem if Garmin never provided an update.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Check the Developer Info menu

Review the video at https://www.youtube.com/watch?v=Zn_9nQzkb7w. In particular you’ll see “Developer Info” as an offering and if you go to that page at the bottom you’ll see “PCB Information”. See if by chance the chipset is designated on that screen. Look for any down arrow as well once at that screen

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John from PA

Excellent suggestion!

John from PA wrote:

Review the video at https://www.youtube.com/watch?v=Zn_9nQzkb7w. In particular you’ll see “Developer Info” as an offering and if you go to that page at the bottom you’ll see “PCB Information”. See if by chance the chipset is designated on that screen. Look for any down arrow as well once at that screen

That is an excellent suggestion John from PA. I had actually thought of looking at the developer and diagnostic menus to see if the chipset could be ID'ed, but in looking at my devices, I came up empty handed so I never mentioned it.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Additional info and corrections.

I want to add some corrections and additional info to what I have posted in the earlier posts in this thread. I have referred to the 2019 rollover problem as "Date rollover", but "week rollover" is a more accurate description. It is based on the fact that GPS calculates the current date using a 10 bit value for the number of weeks from some reference date. 10 bits is 1024, so 1024 weeks is 7168 days or about 19.6 years. I had said in an earlier post that it was 20 years PLUS some odd number of days behind, but it actually resets 20 years MINUS some odd number of days. The concept is still the same, but the incorrect date will actually be a later month and day than the correct current date. So that can still generate incorrect interpretation of DST and cause the time to be off by an hour. Dave520 can probably confirm this by the date he saw on the Current.GPX file.

I also ran across a thread in another forum regarding a zumo 660 https://www.zumouserforums.co.uk/viewtopic.php?t=401. In this case, the zumo was still showing the correct date after the 2019 rollover occurred UNTIL THE OWNER CHANGED THE BATTERY. Removing and reinstalling the battery caused the device to reset and then the incorrect date/time showed up. In this case Garmin did eventually provide a firmware fix for the zumo 660. Lets hope they did the same for the nuvi 40.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Factory Diagnostic Screens?

John from PA wrote:

Review the video at https://www.youtube.com/watch?v=Zn_9nQzkb7w. In particular you’ll see “Developer Info” as an offering and if you go to that page at the bottom you’ll see “PCB Information”. See if by chance the chipset is designated on that screen. Look for any down arrow as well once at that screen

There might be more device info available on the Factory Diagnostic Screens? With GPS device fully powered ON, then holding finger on the upper-right corner of touchscreen for ~5 seconds to access those hidden screens and tests.

The 'Inventory' should list the latest version 'Time Zone Map 27.00' I believe.

The video I linked to covers it well…

tli wrote:
John from PA wrote:

Review the video at https://www.youtube.com/watch?v=Zn_9nQzkb7w. In particular you’ll see “Developer Info” as an offering and if you go to that page at the bottom you’ll see “PCB Information”. See if by chance the chipset is designated on that screen. Look for any down arrow as well once at that screen

There might be more device info available on the Factory Diagnostic Screens? With GPS device fully powered ON, then holding finger on the upper-right corner of touchscreen for ~5 seconds to access those hidden screens and tests.

The 'Inventory' should list the latest version 'Time Zone Map 27.00' I believe.

I already pointed the OP to a video that explains the process quite clearly. I don’t have a 40LM but I did notice that on my 265WT that the upper right corner is both battery life and time. If your thumb happens to cover both or even a portion of the “time” display, you will not get any additional screen choices. And it did take about 8 to 10 seconds, so be patient.

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John from PA

Status?

dave520, did you ever get this LM40 working correctly?

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John from PA

No Luck!

I have given up on the NUVI 40 for now. I bought Nuvi 2597 for parts on Ebay and all it needed was a battery and some updates. Total spent was about $30 and it works great and has more features. I will either give the Nuvi 40 to a friend or relative. Might try to sell on Ebay. Thank you for all the advice given.

DAve

Smart move.

dave520 wrote:

I have given up on the NUVI 40 for now. I bought Nuvi 2597 for parts on Ebay and all it needed was a battery and some updates. Total spent was about $30 and it works great and has more features. I will either give the Nuvi 40 to a friend or relative. Might try to sell on Ebay. Thank you for all the advice given.

DAve

I was never a fan of those entry level Garmin Nuvi's ... probably not worth wasting any more time with it. I am guessing Garmin came to that same conclusion when they dealt with the week rollover issue.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Is this issue resolved on

Is this issue resolved on most of the newer units?

I have a driveluxe 50 I haven't touched in 2+ years. Other than a dead battery it powered up when connected and obtained sync. Still on the 5.90 firmware as that's the newest/latest available. Tripplanner complains if gpx routes have more than 29 poi/shaping points.

Should not be an issue

zx1100e1 wrote:

Is this issue resolved on most of the newer units?

I have a driveluxe 50 I haven't touched in 2+ years. Other than a dead battery it powered up when connected and obtained sync. Still on the 5.90 firmware as that's the newest/latest available. Tripplanner complains if gpx routes have more than 29 poi/shaping points.

As near as I can determine the DriveLuxe 50 was released in the 4th quarter of 2016. At that time the issue with the GPS was well known and devices had firmware to handle the situation right out of the box. The OP has a nuvi 40LM which dates from 2011, five years ahead of the DriveLuxe 50.

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John from PA