[ntp:questions] ntp version 4.2.7p257-o

David J Taylor david-taylor at blueyonder.co.uk.invalid
Mon Feb 20 12:45:17 UTC 2012

> It doesn't look great to me.  I'd expect a checksum on the end of the
> sentence consisting of a * and two hex digits 0-9/A-F.  I'm
> disappointed the Sure isn't generating the checksum, as is
> computationally trivial and serial transmission is far from inherently
> error-free.  Earlier NMEA specification versions require the checksum
> only for $GPRMC, but the latest NMEA version mandates checksum on all
> sentences.
> Perhaps there's some way to enable checksum generation via a
> programming sentence from the PC.
> Cheers,
> Dave Hart


I have two Sure GPS devices, both running with the default configuration, 
and I see checksums on both:

C:\>ntpq "-c clockvar &2" alta
associd=9890 status=00f2 15 events, clk_bad_format,
device="NMEA GPS Clock",
poll=24068, noreply=7627, badformat=2690527, baddata=0, stratum=0,
refid=GPS, flags=0

C:\>ntpq "-c clockvar &2" feenix
associd=55229 status=00f2 15 events, clk_bad_format,
device="NMEA GPS Clock",
poll=27448, noreply=6175, badformat=2840824, baddata=0, stratum=0,
refid=GPS, flags=0


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