refclock 28 gone wacky on me

Eric S. Raymond esr at
Fri Jun 10 18:17:07 UTC 2016

Frank Nicholas <frank at>:
> It’s been a while (years), and at the time it was pure NTP (no gpsd involved).  Whatever the sentences were that were pushing it over didn’t happen very close together.  I seem to remember that one was reporting if it was using the external vs. internal antenna and that would probably have been a $PMTK sentence.  I was using an external antenna.  When I use it with gpsd, is gpsd “aware” of that chipset and turning some sentences off ($PMTK)?

Checking...yes, in fact gpsd does thin the MTK sentence mix, to emit
only RMC, GGA, GSV, GSV, GRS, GST, ZDA.  So yes, it's one of the
$PMTK sentences pushing you over.
		<a href="">Eric S. Raymond</a>

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