As for my own experience, i have seen lots of maps without north at the top. Many of the National Park Service maps do not have up/north. Not all Disney park maps are north/up, either. There are others. Further, when actually USING maps, in the air or on the ground, I rarely have North at the top edge of the map as I am looking at it -- unless I am going north. Rather, the map is "oriented" (which means "to the east," which just goes to show that what we think of as standard was not always that way.) Anyway, in the ten years I have been going to Oshkosh, the top of the map being east never confused me. It never even crossed my mind that it should be any different.

Your own personal experiences may vary.