Just had this email from TomTom: it may require YOUR attention!

Your satnav has always been there to guide you, now it needs your help.
On 6 April 2019, the GPS Week Number Rollover may impact your satnav. We are here to help you check and guide you through next steps. Get started below.

Mine was OK - Gordon

The GPS Week Number Rollover (WNRO) occurs every 19 years, with the next roll over taking place on 6 April 2019. Similar to odometers in older cars rolling over from 99,999 km to 0, the GPS WNRO is the resetting of the GPS calendar back to 0.

When the calendar resets, it can cause a miscommunication between GPS satellites and GPS receiver chips. As a result, some chips in satnavs will lose the ability to process certain functions.

Crikey, is that a *permanent* loss of functionality??

I'll be on my way to, or in, Croatia at that stage - a completely new country to me where I'd really like to have the satnav working.

Found this - Which bugs have been fixed?
GPS Week Number Roll Over (WNRO) fix
On April 6 , 2019, there will be a GPS Week Number Roll Over (WRNO) also known as GPS Leap. For the
Driver Terminal to be able to connect to the GPS satellites after this date, updating to version 12.105 is required.

So updating the firmware should do it.

I should get started now - my experiences with updating the tomtom are always fraught, can last days.....

Jean I'd guess your device will not be affected found this

Should I Be Concerned?

Because this it is the second time the GPS week rollover will occur, many receiver manufacturers have prepared for it, and newer receivers will continue to operate without issue.

You should be concerned, though, if either of the following applies:

Receiver has been fielded for more than 10-15 years without firmware updates

From here: https://www.orolia.com/resources/blo...-you-need-know

I'm sure you dont have a device that old, do you?

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No, it's a tomtom camper. Not t sure how long I've had it (it's always longer than you think) but we've been MHing for under 11 years n had a TT One to start with. So I guess I'm OK.

Thanks for the heads up.

Not something I have ever heard of before and I was not sure what sort of roll over and resetting to zero actually means.

The orolla link jiwawa just gave explains it to me well ...... it is to do with the number of weeks since it started and the simple fact that the numbers involved cannot get higher than 1024 and that runs out for the second to,e since the system started on that date in 2019.

I am sure all of us will remember the "Millenium Bug" when it was a major worry that computers would be unable to go from 1999 to 2000 due to the way the numbers were originally calculated.

Thanks for the heads up - I was not aware of it....

Now I am, thanks.

So I guess my Tom Tom 720 loaded with the truck maps from 2015 will give up the ghost? what exactly will happen, I don't need real time journeys, just how to get there.

My understanding is it will continue if it has been updated since 1999 and 2015 versions should be updated when the maps have been done, I hesitate to suggest but could this be why updating TT takes such a long time....?

Thanks for the 'heads up' and additional info telling me that mine is probably OK.

.

As it happens, I connected my TomTom start 25 to my pc 2 days ago, following a thread recently about Spanish speed limits altering. We head off in a few weeks, so was keen to be law abiding. My drive (tomtom updating tool) said I was up to date, so wonder how I am fixed. My satnav is perhaps 7 years old.

I like my Tom Tom particularly since it ‘beeps’ when the speed limit is exceeded. As we all know, even when driving with due care, it is easy to drift over the limit by a few mph.

Davy