Sat Nav

Goldwinger · 20 July 2019 11:17

Anyone help my sat nav has gone haywire showing me in a completely different position to the one I know i’m in

Model is 2012 Venture edition changed the SD card but no different

Any help greatly appreciated

bally3 · 20 July 2019 12:27

hi ,

i got the new sat nav sponsored by the band U2 ,

its rubbish,

"all the streets have no name , and i still havn’t found what i’m looking for "

sorry…

AndrewR · 20 July 2019 13:26

My portable Tom Tom sat Nav lost its GPS position recently. It appears that the Sat Nav satellite has been repositioned and so for me it requires a new Sat Nav. Instead I downloaded an app on my phone which works well. In your case I think you either reset or update the software which hopefully will resolve the problem.

RichardFX · 20 July 2019 13:44

A couple of years ago I was advised after my plug-in Sat-nav suddenly showed errors to leave it switched on for ten to twenty minutes while staying in the same position where it could see lots of sky. This worked.

It seems that the satellites transmit relative-to-each-other timing data as well, and the satnav will learn from this and rebuild its associations. Or so I was told. Is it correct though?

However, I don’t have any science to back this up, and although it worked for my satnav back then it may not work for your satnav today, but it’s worth a try.

Mac5 · 20 July 2019 15:36

There have been problems with the European Galileo satellite system recently…

Linky

Countryboy · 20 July 2019 15:53

After “You know what” I think the UK loses its access to the Galileo system and will have to rely on the US system until “we build our own system”, who do they think they’re kidding!

anon90182272 · 20 July 2019 15:57

GPS satellites are not geostationary, so are constantly orbiting, and they haven’t ‘moved out of position’. You won’t need a new Sat Nav. As suggested make sure it has a clear view of the sky and leave it for a while. It should sort itself out. If a GPS receiver has been switched off for a while, or is moved to a new location while switched off it can take a while to orientate itself. I seem to recall my old handheld Garmin had a ‘new location’ option when it was switched on.

As for the OP the SD card is not relevant to operation the GPS receiver - its primary function is to hold the base mapping.

JS

John_M · 20 July 2019 17:42

Without knowing what’s wrong with it (obviously) it’s definitely worth trying leaving it switched on and stationary for a while. Mine didn’t have an accurate fix when I drove off a ferry at Hook of Holland last summer. It was in the right town and wasn’t reporting any problem finding satellites - behaving in fact as it normally does. It took me a while to twig as it was giving me instructions, but none of them made much sense. It nearly had me turning down a cycleway at one point (the Dutch get very upset if you do this). It kept this up for about an hour while I switched to Google maps on the phone.

Once at the hotel, after a restart and leaving it to gather its wits without moving, it got an accurate fix and has been fine ever since

Roadie · 20 July 2019 20:16

Could be due to the ‘GPS Week Number Rollover’ which happened in April. I was warned by TomTom that my stand alone satnav needed updating.

Here’s a clip from t’interweb -

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.

What does this mean for you? It’s time to check your satnav. Depending on your device, you may need to update or upgrade.

The weekly timing system used by GPS devices will reset itself this Saturday, 6 April 2019. If you own an older, portable or built-in sat nav, or don’t regularly update your sat nav, it could be affected. known as GPS Week Number Rollover (WNRO), this occurs due to limitations in the data that can be held by GPS devices. So after 1,024 weeks, the system resets to zero. For owners of newer or up-to-date portable sat navs, there’s little to worry about. However, if you have an older sat nav, you may experience a loss of timing functionality. This means not only the time and date, but also estimated time of arrival at your destination. Your sat nav should still be able to estimate how long your journey will take, however. Affected devices may not simply stop working instantly, but could exhibit inaccuracies and a loss of functionality as time progresses, depending on firmware. The GPS system relies on precise timing data to operate accurately, so even the smallest inconsistency and result in large location errors. The last WNRO event occurred in 1999.

Read more: https://www.which.co.uk/news/2019/04/will-your-sat-nav-stop-working-this-saturday/ - Which?

The weekly timing system used by GPS devices will reset itself this Saturday, 6 April 2019. If you own an older, portable or built-in sat nav, or don’t regularly update your sat nav, it could be affected. known as GPS Week Number Rollover (WNRO), this occurs due to limitations in the data that can be held by GPS devices. So after 1,024 weeks, the system resets to zero. For owners of newer or up-to-date portable sat navs, there’s little to worry about. However, if you have an older sat nav, you may experience a loss of timing functionality. This means not only the time and date, but also estimated time of arrival at your destination. Your sat nav should still be able to estimate how long your journey will take, however. Affected devices may not simply stop working instantly, but could exhibit inaccuracies and a loss of functionality as time progresses, depending on firmware. The GPS system relies on precise timing data to operate accurately, so even the smallest inconsistency and result in large location errors.

Read more: https://www.which.co.uk/news/2019/04/will-your-sat-nav-stop-working-this-saturday/ - Which?

AndrewR · 20 July 2019 21:50

Roadie:

Could be due to the ‘GPS Week Number Rollover’ which happened in April. I was warned by TomTom that my stand alone satnav needed updating.

Here’s a clip from t’interweb -

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.

What does this mean for you? It’s time to check your satnav. Depending on your device, you may need to update or upgrade.

The weekly timing system used by GPS devices will reset itself this Saturday, 6 April 2019. If you own an older, portable or built-in sat nav, or don’t regularly update your sat nav, it could be affected. known as GPS Week Number Rollover (WNRO), this occurs due to limitations in the data that can be held by GPS devices. So after 1,024 weeks, the system resets to zero. For owners of newer or up-to-date portable sat navs, there’s little to worry about. However, if you have an older sat nav, you may experience a loss of timing functionality. This means not only the time and date, but also estimated time of arrival at your destination. Your sat nav should still be able to estimate how long your journey will take, however. Affected devices may not simply stop working instantly, but could exhibit inaccuracies and a loss of functionality as time progresses, depending on firmware. The GPS system relies on precise timing data to operate accurately, so even the smallest inconsistency and result in large location errors. The last WNRO event occurred in 1999.

Read more: https://www.which.co.uk/news/2019/04/will-your-sat-nav-stop-working-this-saturday/ - Which?

The weekly timing system used by GPS devices will reset itself this Saturday, 6 April 2019. If you own an older, portable or built-in sat nav, or don’t regularly update your sat nav, it could be affected. known as GPS Week Number Rollover (WNRO), this occurs due to limitations in the data that can be held by GPS devices. So after 1,024 weeks, the system resets to zero. For owners of newer or up-to-date portable sat navs, there’s little to worry about. However, if you have an older sat nav, you may experience a loss of timing functionality. This means not only the time and date, but also estimated time of arrival at your destination. Your sat nav should still be able to estimate how long your journey will take, however. Affected devices may not simply stop working instantly, but could exhibit inaccuracies and a loss of functionality as time progresses, depending on firmware. The GPS system relies on precise timing data to operate accurately, so even the smallest inconsistency and result in large location errors.

Read more: https://www.which.co.uk/news/2019/04/will-your-sat-nav-stop-working-this-saturday/ - Which?

Thanks Roadie that’s the explanation I was given on my Tom Tom portable sat nav. Switched to a phone app to avoid the cost of replacing it. Works well.

tee_hee_johnson · 26 July 2019 16:17

Roadie:

Could be due to the ‘GPS Week Number Rollover’ which happened in April. I was warned by TomTom that my stand alone satnav needed updating.

Here’s a clip from t’interweb -

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.

What does this mean for you? It’s time to check your satnav. Depending on your device, you may need to update or upgrade.

The weekly timing system used by GPS devices will reset itself this Saturday, 6 April 2019. If you own an older, portable or built-in sat nav, or don’t regularly update your sat nav, it could be affected. known as GPS Week Number Rollover (WNRO), this occurs due to limitations in the data that can be held by GPS devices. So after 1,024 weeks, the system resets to zero. For owners of newer or up-to-date portable sat navs, there’s little to worry about. However, if you have an older sat nav, you may experience a loss of timing functionality. This means not only the time and date, but also estimated time of arrival at your destination. Your sat nav should still be able to estimate how long your journey will take, however. Affected devices may not simply stop working instantly, but could exhibit inaccuracies and a loss of functionality as time progresses, depending on firmware. The GPS system relies on precise timing data to operate accurately, so even the smallest inconsistency and result in large location errors. The last WNRO event occurred in 1999.

Read more: https://www.which.co.uk/news/2019/04/will-your-sat-nav-stop-working-this-saturday/ - Which?

The weekly timing system used by GPS devices will reset itself this Saturday, 6 April 2019. If you own an older, portable or built-in sat nav, or don’t regularly update your sat nav, it could be affected. known as GPS Week Number Rollover (WNRO), this occurs due to limitations in the data that can be held by GPS devices. So after 1,024 weeks, the system resets to zero. For owners of newer or up-to-date portable sat navs, there’s little to worry about. However, if you have an older sat nav, you may experience a loss of timing functionality. This means not only the time and date, but also estimated time of arrival at your destination. Your sat nav should still be able to estimate how long your journey will take, however. Affected devices may not simply stop working instantly, but could exhibit inaccuracies and a loss of functionality as time progresses, depending on firmware. The GPS system relies on precise timing data to operate accurately, so even the smallest inconsistency and result in large location errors.

Read more: https://www.which.co.uk/news/2019/04/will-your-sat-nav-stop-working-this-saturday/ - Which?

It’s not this, TomTom had a checking website in preparation for this and putting the the satnav model from the Vantage, it would come back with not affected.

tee_hee_johnson · 26 July 2019 16:19

Same car as mine! What colour?

When I got mine, also a 12 plate, it maintained that I was somewhere in Ireland… Not Glasgow.

The fix for me was fully updating all the ‘free’ things using TomTom home using the SD card in my laptop.

I think the thing that made the difference was coming up many many versions of the GPS quickfix part of the software.

Good luck!

tee_hee_johnson · 26 July 2019 16:21

JS46:

AndrewR:

My portable Tom Tom sat Nav lost its GPS position recently. It appears that the Sat Nav satellite has been repositioned and so for me it requires a new Sat Nav. Instead I downloaded an app on my phone which works well. In your case I think you either reset or update the software which hopefully will resolve the problem.

GPS satellites are not geostationary, so are constantly orbiting, and they haven’t ‘moved out of position’. You won’t need a new Sat Nav. As suggested make sure it has a clear view of the sky and leave it for a while. It should sort itself out. If a GPS receiver has been switched off for a while, or is moved to a new location while switched off it can take a while to orientate itself. I seem to recall my old handheld Garmin had a ‘new location’ option when it was switched on.

As for the OP the SD card is not relevant to operation the GPS receiver - its primary function is to hold the base mapping.

JS

It does, the SD card holds the map data but also the TomTom nav core, software updates and communication layers.

anon90182272 · 26 July 2019 20:37

Interesting - thank you. I was basing this on the fact updated maps for many built in sat navs come on new, replacement, CD or SD cards. Changing these would lose updates etc if this is the case. How do Mazda achieve map updates? Something else ‘locked’ the dealer network, it seems. I’ll stick with my standalone Garmin.

JS

PHILC1 · 26 July 2019 21:30

I had the same problem with the sat-nav in my 2012 venture edition. I fixed it by removing the SD card from the car, inserting it into my lap top using the TOMTOM webpage to update the GPS. This happened a couple of years ago and has never faltered since. Hope this helps./quote]