Yes seems straightforward.....

adding 

--nmea=file,out,60,/home/mat/Flightgear/data/Protocol/recordednmea

to fgfsrc

created the recordednmea file OK 
First few and last couple of lines from a climb to around 6000 feet
heading west looked like this:


$GPRMC,041051,A,4340.0891,N,00713.5881,E,2.5,224.9,130704,0.5,E,A*16
$GPGGA,041051,4340.0891,N,00713.5881,E,1,08,0.9,4.7,M,0.0,M,,*73
$GPGSA,A,3,01,02,03,,05,,07,,09,,11,12,0.9,0.9,2.0*38

$GPRMC,041322,A,4335.9499,N,00710.5706,E,92.5,204.7,130704,0.5,E,A*28
$GPGGA,041322,4335.9499,N,00710.5706,E,1,08,0.9,2140.4,M,0.0,M,,*48
$GPGSA,A,3,01,02,03,,05,,07,,09,,11,12,0.9,0.9,2.0*38


then to replay your recorded flight change fgfsrc by adding 


--fdm=external
--nmea=file,in,60,/home/mat/Flightgear/data/Protocol/recordednmea

No attitude, sounds etc obviously.

Thanks Curtis

As you say initially a vastly simpler route to replaying flights would
be to approximate attitude etc  although this is still beyond me.
Maybe an FDM called "replay" that somehow used the type of code that
enables the FG AI aircraft to bank on turns might be a way of doing it.

Mat




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