To muddy the picture of the surface current, so to speak.
This is the surface current plot for June 5, the box is centered on 3N 30W.
Red / orange marks the strongest surface current.
The page with the chart in the pdf file is titled:
Previsions 3D de courant quotidiennes a J+1 et J+6
The chart is titled:
courants marins (0m) du 05/06/2009 echeance 24h
The only charts included are those for June 5, though the page title indicates there are other dates not provided.
The current direction is SW to NE which would suggest that if AF447 crashed east of 30W, the debris and bodies would be carried to the east. Instead the bodies and wreckage have been found west of 30W.
It is possible the the charts for the surface currents on June1-4 -- if the current changed -- would allow for bodies and wreckage to be carried from east to west.
The other current chart included in the pdf is for 1000 meters; that current is very light and moving from east to west.
Source:
pdf p 5 of this document:
http://www.bea.aero/fr/enquetes/vol....hom.050609.pdf