Bob Camp wrote:
Hi
… and since NTP is open source, doing the hack is not dependent on getting a
new firmware image for the GPS.
Hacking ntpd is one possibility, with the risk that a workaround for
some broken GPS receiver also affects GPS receivers which are working
correctly.
At least in some of ntpd's refclock drivers you can configure a fixed
offset using a "fudge time1 ..." command., e.g. for the parse driver
fudge 127.127.8.0 time1 7200
would add a 7200 s offset to the time from the refclock. As far as I
know this also works for larger offsets, at least with the parse driver,
and this possibly can also be used to fix a constant offset for broken
GPS receivers, depending of the refclock driver used.
Anyway, I think it's worth a try, and it would not require any code
change in ntpd or the firmware.
Martin
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