In episode 144, around 15:45 of One Piece, while salvaging the ship of a navigator that fell from the sky, Sanji came across a picture. The woman in the picture looked almost exactly like Nami.
It can't be a coincidence because Nami is a prodigy when it comes to navigation, and picture of her look-alike just happen to be at a navigator's ship.
Was that just a coincidence? Is there any theory related to that picture?