Quote:
Originally Posted by JSWolf
But if you have an internal ToC, you end up with two ToC instead of just one.
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In an EPUB, yes. But only because EPUB readers use the NCX file to generate a table of contents to present to the user.
With a MOBI file, though, and on the Kindle, the NCX file isn't used to present a table of contents to the user - it simply makes it possible to jump to the next or previous navigation point using the 5-way control button. The only kind of TOC presented to the user in a MOBI file is an inline TOC, created as part of the book content. The MOBI reader then needs a guide item (placed in the OPF file when creating the files used to build the MOBI file, then inserted into the HEAD section of the HTML inside the resulting MOBI file) which points to the location of the inline TOC, so that the reader device or app's "Go To... Table of Contents" menu item will link to the correct location in the book content.