I have a bad line in my igc trace from LK8000 running on my Glider Guider. It was only one line, but there was a "-" in the line, and the latitude was marked as North, rather than South.
ERROR in IGC File B030444-3559182N14622568EA0098401021 CORRECTed Line B0304443559182S14622568EA0098401021