[ntp:questions] What is the NTP recovery time from 16s step in GPSserver?
nomail at example.com
Wed Oct 31 08:35:26 UTC 2012
David Woolley <david at ex.djwhome.demon.invalid> wrote:
> Kennedy, Paul wrote:
>> I believe the answer to your question is 12.5 minutes.
>> This is the time it takes to receive the full set of 25 almanac frames,
>> which contains the GPSTime/UTC offset (amongst other things).
> I think he knows the time taken for the GPS receiver, which is a lot
> less than that. His concern is about how long ntpd takes once the GPS
> receiver is reporting the correct time. As noted, ntpd is not specified
> for this case, so makes no attempt to recover any faster than any other
> broken local clock case.
The main point is that the local clock is not supposed to be broken.
It worked OK years ago when I implemented it, and I wonder what has
changed now so that it no longer works. Maybe a change in the Trimble
firmware or a change in gpsd (although I do not see that in the git
When this has been cleared up and fixed, gpsd should not provide time
until the receiver reports the correct values.
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