Hm, in November on Rotterdam, I thought I had priority boarding being a four star mariner, but I just arrived with my daughter at the assigned boarding time and waited (quite a while) to board. I don't remember which boarding group we were assigned, but we sat close to an hour waiting for it to be called. My boarding pass didn't have the words "priority boarding" anywhere on it (although it did specify "Four Star Mariner") and there were no signs at embarkation for "priority boarding." I'm booked on NA out of Fort Everglades next week, and just got an email telling me my boarding time, in group C, is at 11:40. I think we will try Catlover54's advice and just show up at 11 and ask for "priority boarding"...