GPS time synch

Christian T. christian.t.80 at
Wed Feb 21 01:57:06 CET 2007

Richi Plana wrote:
> I'd like to know what the difference is between the two accuracy-wise,
> though.

NTP can be as accurate as ± 50ms on a (not saturated) internet-line.
± 150ms should always be possible.

GPS is - in theory - much more precise, but only if you have a
GPS-Receiver which is designed for being used at time-servers etc.

And it depends mostly on the protocol you are talking to the GPS. If you
have a serial- or USB-connection and are using the NMEA-protocol you
will get the time rounded to a full second and the datagram arrives
somewhen in this second so you would have something like ± 1s accuracy.

-- Chris

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