As far as I'm aware it's purely dependent on whether the author/publisher has inserted the chapter marks in the book. They either have them or they don't and there's nothing you can do in the settings to change it.
I've had a few that don't have them, but most seem to. Just checked the books currently on my Kindle (a mix of daily freebies from Amazon, books bought from Amazon and a handful of bought/library epubs converted to mobi) and out of the 25, 8 don't have chapter markings, and 6 of those are freebies.
Edited to add: just to be clear, I have a Kindle 3 (keyboard), and I just assume that the Kindle 4 & Kindle Touch both still include this feature.
Last edited by soulfuldog; 03-04-2012 at 02:33 PM.
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