GitHub - scubajorgen/FitReader: Library for reading the ANT FIT file format. This format is used by Garmin GPSses. See http://blog.studioblueplanet.net/?page_id=468
Help! Corrupted .FIT file - Garmin Connect Web - Mobile Apps & Web - Garmin Forums
Malformed restored .fit file - Garmin Connect Web - Mobile Apps & Web - Garmin Forums