David J Taylor wrote:
"Mr Dave Baxter" <[email protected]> wrote in message
[]
Indeed, but is GPGGA the correct sentence for NTPD to use? Mine is set
for GPRMC & works just fine.
pip pip
Dave B.
It depends on the NTP version, Dave. I believe that newer versions allow
more sentences. Like you, I've used the originally recommended $GPRMC.
It's important not to use too many sentences otherwise they can't all
fit into the available time at 4800 baud - I recommend using a single
$GPRMC sentence type.
GPGGA has one added benefit: If you turn on clockstats you get a log of
the current position every second, this is perfect input for a
statistical averaging of the current antenna position. :-)
Afair you also get quite a bit of position/time quality information, in
the number of currently tracked sats and the current DOP value.
Otherwise they are pretty much equivalent.
Terje
--
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
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