In article ,
says...
I am looking for NMEA-logfiles from real soaring flights with original
1 Hz NMEA output, being interested in the coordinates, track and
ground speed. IGC-files are not sufficient because calculating track /
speed as well interpolating track / speed / coordinates out from a
0.25 Hz IGC-file results in lower precision.

What will you be using the files for?
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Eric Greenwell USA