Luke: No, my father didn't fight in the Clone Wars. He was a navigator on a spice freighter. Obi-Wan: That's what your uncle told you. He didn't hold with your father's ideals; he felt he should've stayed here and not gotten involved. Luke: You fought in the Clone Wars? Obi-Wan: Yes. I was once a Jedi knight, the same as your father. Luke: I wish I'd known him. Obi-Wan: He was the best star pilot in the galaxy, and a cunning warrior. I understand that you've become quite a good pilot yourself. [sorrowfully] Obi-Wan: And he was a good friend.

Watched the scene, I'd have to say that what I thought was correct. He doesn't say "just" either. From this conversation, I just don't see it as him being a navigator on a spice freighter, but a real "star pilot". Sorry.