Oh crap... hoped it would have been some sort of mix between predefined shape and gps recording. You can close the case and thanks for the hint about dynamic map.

UPDATE > SOLVED - SEE HARRYS ANSWER Problem : The overlay of the racetrack "Anneau du Rhin" is quite bad to be honest, specially compared to other videos out there from the same racetrack. There are two available racetracks - I tried both of them with the same result. Any suggetions? See ...