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Date rollover for GPS systems

 
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cwog
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PostPosted: Wed Feb 13, 2019 2:06 pm    Post subject: Date rollover for GPS systems Reply with quote

See
https://www.theregister.co.uk/2019/02/12/current_gps_epoch_ends/

for details of a date rollover on GPS system that might break the system for you.
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Kremmen
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PostPosted: Wed Feb 13, 2019 2:24 pm    Post subject: Reply with quote

They seem to be questioning older devices from non mainstream companies produced before 2010.
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PhilHornby
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PostPosted: Wed Feb 13, 2019 3:39 pm    Post subject: Re: Date rollover for GPS systems Reply with quote

cwog wrote:
...date rollover on GPS system that might break the system for you.

It's hard to imagine how the date would be involved in Route Calculations, but I could imagine it might upset Daylight Saving calculations ... and the automatic Day/Night display.

There could, I suppose, be an impact on Traffic Trends-type routing...if the day-of-the-week gets miscalculated.

Do any Garmin systems display the date?
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MaFt
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PostPosted: Wed Feb 13, 2019 6:18 pm    Post subject: Reply with quote

I've been trying to contact Garmin about this to see if it's an issue with theirs. I know TomTom have a support page where you can enter your serial number and find out if there's an update or if it will need a replacement.

I would hope that with Garmin's history in GPS as well as aircraft and sea navigation, and their previous survival after the last one in 1999, that they'll be using the 13-bit version and not have an issue... Still, this is just speculation.

TomTom's link is mentioned in this post: https://www.pocketgpsworld.com/modules.php?name=Forums&file=viewtopic&t=98799
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dales
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PostPosted: Thu Feb 14, 2019 12:05 am    Post subject: Re: Date rollover for GPS systems Reply with quote

PhilHornby wrote:
Do any Garmin systems display the date?
Yes, my Garmin handhelds do.

My Oregon 700 has a full calendar function, which highlights Today on its home page.
And the date, month, year can be shown in one of the optional data fields.
And the date is automatically shown on the heading of the Status dashboard (if chosen).

Dales.
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Kremmen
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PostPosted: Thu Feb 14, 2019 5:57 am    Post subject: Reply with quote

The Y2K issue could raise its head again around 2050 if any old systems are still around.

The system I worked on went down the lines of ......

If YY is less than 50 then CC = 20, else CC = 19.

So the old YYMMDD became CCYYMMDD where CC was a simple calculation.
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cwog
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PostPosted: Thu Feb 14, 2019 10:39 am    Post subject: Reply with quote

The date accuracy may effect accuracy of predicting satelllite position and time delay for calculating posiion -

but
hey
what do I know - I referred to the article because El Reg always has interesting tech news
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PhilHornby
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PostPosted: Thu Feb 14, 2019 12:20 pm    Post subject: Reply with quote

cwog wrote:
The date accuracy may effect accuracy of predicting satelllite position and time delay for calculating position

I think The Register's tipster may have embellished the story a little - the Dept. of Homeland Security's (pdf) only talks about possible problems "obtaining UTC from GPS Time"

Ref: https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf
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