Yes, the toc.ncx file governs the creation of the ticks... you don't have to have a tick for every chapter, especially in large books with, say, 40-odd chapters. You just decide which chapters are important "break points" in the story. Here is an extract from my toc.ncx, just for the first tick point:
<navPoint id="chap1" playOrder="1">
<navLabel><text>1: Old Flame</text></navLabel>
<content src="cocoon-01.html" />
</navPoint>
...but the hand-coded toc.ncx file just isn't included with my other content files when importing and assembling via Calibre, so I don't get any ticks. Right now I am trying to figure how to import all my content into Sigil, so I can output an ePub file that could be then converted to MOBI complete with the original toc.ncx file. My main problem is that all my content was hand-coded in html and Sigil can't see it... it has to be in xhtml.
