This looks a little odd, the Ile de Sein looked like it made a quick stop in Las Palmas de Gran Canaria, then was headed southwest at 11-12 kts, slowed to a knot or less, and did a maneuver roughly shaped like a backward lowercase cursive L, and now is heading west or southwest still under a knot.
I figured they had about a 5-6 day trip to the crash site when they left Palmas de Gran Canaria, where maybe they stopped quickly for provisions, personnel, or equipment, not sure what is up?
Live Ships Map - AIS - Vessel Traffic and Positions