[ntp:questions] First attempt GPSD/PPS ->NTP time server

Folkert van Heusden folkert at vanheusden.com
Sun Jan 27 01:08:55 UTC 2008


> The GPS time is not very accurate anyway, and can vary wildly, probably 
> depending on the device, so don't expect perfect offsets.  On my Garmin GPS 
> 18 LVC, I use 0.190 which gets it in the ballpark, but can randomly jump 
> +16ms to -10ms at any time.

But if you let ntp handle the pps signal it should be a steady 0.0-0.1ms
difference as it then knows when this second started:
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+GPS_NMEA(0)     .GPS.            0 l   17   16  376    0.000   -0.001   0.001
oPPS(0)          .PPS.            0 l    5   16  377    0.000   -0.001   0.001


Folkert van Heusden

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