Indeed. If you don't have a navy to transport it, a crusade from Castilles' quickest route to Morocco will actually be to go back up north, eastwards through Europe, southeast through the Balkans to Constantinople, continuing southeast to Rum, southwards 'till Sinai, then finally down the stretch, going westwards through all of north Africa. And that, my good friend, is one very, very, doomed crusade.(99% of the time.)