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Re: [gpsd-dev] [PATCH] [log.chk] [TPV timing] implement $GPVTG message,


From: teyrana
Subject: Re: [gpsd-dev] [PATCH] [log.chk] [TPV timing] implement $GPVTG message, and proper timing for output "TPV" messages
Date: Fri, 18 May 2018 09:01:57 -0400


> This patch reports track and speed.

Was the heading already there?


Yeah, that "ATT" message was already there.  It is emitted from the vanilla (3.17) code.



  https://hemispheregnss.com/gnssreference/GPVTG.htm

It reports track in true AND magnetic.  It reports Speed in knots and
km/h.


Yes,  it reports true-track and magnetic-track.  We agree on this.

The magnetic track, though, where should that be written?  *Specifically*, which member of which struct?   Because I don't see any match in gpsd's documentation: http://www.catb.org/gpsd/gpsd_json.html



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