I converted a gnu software manual to mobi format. I generate a toc.html and and a toc.ncx. There isn't much difference between them as to contents. The format and the layout is quite different!
If I use the kindle previewer and press the ncx button I get to see a tree structure with collapsible items.
However on the kindle 3 it is just the html TOC. How do I get to the ncx data on the kindle 3