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 Post subject: GPS rollover and potential problems
PostPosted: Wed Feb 13, 2019 11:28 am 
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Joined: Sat Apr 15, 2017 9:04 am
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There's been some recent posts in the technical press about GPS date rollover on April 6th this year and potential problems ensuing from that. It's similar to the Millenium bug - the GPS date code can only count to 1024 weeks before it starts at 0 again. Last rollover was in August 1999. If this has not been taken into account in the GPS system design, the date could reset and could cause serious positional and timing errors.

Apparently manufacturers should be aware of this. I've done a search on Nissan but not found anything remotely useful. Even a GPS specification for the satnav could be useful. ANybody have any info/comments on this?


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 Post subject: Re: GPS rollover and potential problems
PostPosted: Wed Feb 13, 2019 11:52 am 
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AMB wrote:
There's been some recent posts in the technical press about GPS date rollover on April 6th this year and potential problems ensuing from that. It's similar to the Millenium bug - the GPS date code can only count to 1024 weeks before it starts at 0 again. Last rollover was in August 1999. If this has not been taken into account in the GPS system design, the date could reset and could cause serious positional and timing errors.

Apparently manufacturers should be aware of this. I've done a search on Nissan but not found anything remotely useful. Even a GPS specification for the satnav could be useful. ANybody have any info/comments on this?


What this space. We're doomed. I blame Trump.
Malcolm.


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 Post subject: Re: GPS rollover and potential problems
PostPosted: Wed Feb 13, 2019 12:11 pm 
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Hi, just been looking into this. It would seem that cars sat nav's are unaffected as date stamp is of no relevance. Sat nav's work on finding the position of a number of satellites to be able to triangulate the devices position. But we will have to see :whistle:


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 Post subject: Re: GPS rollover and potential problems
PostPosted: Thu Feb 14, 2019 8:50 am 
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Joined: Sat Apr 15, 2017 9:04 am
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bertye wrote:
Hi, just been looking into this. It would seem that cars sat nav's are unaffected as date stamp is of no relevance. Sat nav's work on finding the position of a number of satellites to be able to triangulate the devices position. But we will have to see :whistle:


I have also been looking into it and think that there may well be a problem. The timestamp is partly needed to calculate location. It apparently comes down to how well the GPS handles GPS Time-to-UTC conversion.

The US GPS website claims that GPS systems built in accordance with the ICD-200/IS-GPS-200 specification should be OK. So presumably T32s will be fine. Advice is to contact the manufacturer. Are Clarion still in business?

TomTom are also advising owners of their satnavs and owners of Renault cars with built in systems to see whetehr their systems need an update.
https://www.tomtom.com/en_gb/updates/


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 Post subject: Re: GPS rollover and potential problems
PostPosted: Thu Feb 14, 2019 2:43 pm 
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Joined: Wed Sep 30, 2015 1:03 pm
Posts: 464
Location: Portsmouth
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Mods: Celtic Tuning Remap to 170HP, EGR deleted, Rear exhaust box removed, K&N air filter, inter-cooler mods
I checked out the TomTom site, and now I think that there will have a problem with my satnav in the 2005 T30. I like the Satnav it has except for the fact that having to put a road name instead of a post code a pain. My TomTom Go530 needed the update which they do for it, so that's done now.


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 Post subject: Re: GPS rollover and potential problems
PostPosted: Sat Feb 16, 2019 1:57 pm 
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I've contacted Nissan UK support as per advice on the Clarion site. Not holding my breath.


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 Post subject: Re: GPS rollover and potential problems
PostPosted: Sat Feb 16, 2019 6:18 pm 
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Location: Northumberland
Car:: Xtrail
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Mods: Towbar + 13 pin electrics, mud flaps, front bug deflector side bump strips.
Emailed Nissan Customer Support. Not holding my breath for a reply.
Malcolm


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