@Kayadelenium:
epubveri does not flag incomplete nav/ncx files.
NAV:
Code:
<body epub:type="frontmatter">
<nav epub:type="toc" id="toc" role="doc-toc">
<h1>Table of Contents</h1>
</nav>
<nav epub:type="landmarks" id="landmarks" hidden="">
<h1>Landmarks</h1>
</nav>
</body>
NCX:
Code:
<navMap>
<navPoint id="navPoint1">
<content src="Text/Section0001.xhtml" />
</navPoint>
</navMap>
EPUBCheck reported 3 errors and a warning.