Re: [gpsd-users] Raspberry Pi, GPIO PPS and NTP

[Chris Hastie]

On 09/06/16 07:50, Gary E. Miller wrote:
> > I would like to be able to use ntp's gpsd-ng json driver (type 46).
> Uh, don't do it.  The only way to make it work properly is undocumented.
>
> Wait until it gets properly fixed.  The SHM drivers work better, and
> work as documented.

Intrigued now :)

I thought I'd try various configurations and see which works best. I've 
had the SHM driver going for about 9 hours now and is producing 
considerably more jitter than my earlier test with NTP's PPS driver. 
This might be because I took the advice in the NTP docs to ignore the 
advice in the gpsd docs to use a minpoll of 4. I've just changed that, 
so I'll see how it goes from here.


Cheers

Chris