RE:A little help from the posterbobby, the direction of the small triangles show the orientation of the rig, not necessary its trajectory, it was towed. Pass your mouse pointer above each triangle and you will see the individual data appear including the time of the record.
For those who did not find it:
https://www.marinetraffic.com/en/ais/home/shipid:201076/zoom:10
- push the FPF-1 status window a bit aside and keep it there
- zoom on Gdansk
- zoom above Ostrow, a big square (light blue) will appear
- click the Past Track button on the FPF-1 status window