Ah, I got it. OK.
@Everyone: There is one thing I houserule to boost knowledges in my games.For every 2 successes on Knowledge test you can add +1 to active skill dicepool, if the knowledge is relevant for the task.
So next time you better roll Knowledge and then the active skill, because in this very case Area Knowledge would give you 2 more dices on Navigation.
I know I should have tell it before.
So, Vinmun, replenish one point of edge for Judah for discovering this