And then I discovered the unicsv format: $ gpsbabel -t -i nmea -f test.nmea -o unicsv -F out.csv $ more out.csv No,Latitude,Longitude,Speed,Course,Date,Time 1,41.549754,0.652421,0.0,196.5,2013/06/14,11:04:06.699999 Read that in with read.table or read.csv, parse the date and time, set coordinates, set CRS... Barry