I never saw Tick Marks on the first Kindles, but I see them now. So I am not sure if this is only for the newer Kindles or if it's only newer books that have them. But I like them. There is a bar at the bottom of the screen with little ticks, and you can use the five-position button to move between ticks in the book. Usually they are for the different chapters, but I hear that they can also go between sections. I love this feature. I use it a lot, and now I look for it on every book I read. Anyone else?