Matthew Petach <[email protected]>:
> On Sun, Mar 10, 2019 at 8:04 PM Stephen Satchell <[email protected]> wrote:
>
> > So far as I can tell with NTP, there was no issue with time sources
> > becoming false-tickers, including my local GPS appliance. FWIW.
> >
> >
> I believe the rollover is *next* month, in April. :)
> https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf
>
> "This paper is intended to provide an understanding of the possible effects
> of the April 6, 2019 GPS Week Number Rollover on Coordinated Universal Time
> derived from GPS devices."
I'm a domain expert in this area - lead of NTPsec and GPSD.
Everything said in that memo is correct. I would add only that it is
more normal now than not for GPSes to have a hidden pivot date. "For
example, a particular GPS device may interpret the WN parameter
relative to a firmware creation date and would experience a similar
rollover event 1024 weeks after that firmware creation date." Yes,
exactly.
It is therefore unlikely that your GPSes will become falsetickers on 6
April. That's the good news. The bad news is that they *will* go
poof some unpredictable number of weeks later.
--
<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>
My work is funded by the Internet Civil Engineering Institute: https://icei.org
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