I am driving FlightGear using a text file.  That data that I have  
includes magnetic heading, but not true heading, so I am supplying  
that.  All seems to be working correctly in FlightGear.  But if I try  
to display the data using Atlas  the heading remains 0 degrees ( -- 
nmea=socket,out,0.5,127.0.0.1,5500,udp).  I looked at the UDP data  
that is being output from FlightGear and the heading is 0 degrees.
So my question is why is FG apparently correctly displaying the  
heading, and the attitude, but outputing 0 for the heading?  If I  
just manually fly FG, I do get the correct heading in my nmea data.
I believe that NMEA data contains true heading, and I am inputting  
magnetic, so that might be the cause.  But, since FG is displaying  
things correctly it seemed odd.
If anyone has a clue about what is going on, my next question is  
whether there is any work around?

--Adam




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