Pugwash

see this thread http://avic411.com/index.php?/topic/30457-how-to-convert-drive-logs-into-gpx-format/

The single byte after the date appears to be the current speed in Kilometres Per Hour. The correct Longitude, referred to as X and Latitude, referred to as W can be found by dividing by 921600. I didn't realise it was a constant factor till I saw your right and wrong answer which are 500km from me. The last 4 bytes may be something to do with the Eco reading or altitude.