Here is a NAV ToC you can use as a sample.
Code:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">
<head>
<title>Probability Space</title>
<meta http-equiv="default-style" content="text/html; charset=utf-8"/>
<link rel="stylesheet" type="text/css" href="styles/stylesheet.css"/>
</head>
<body>
<nav epub:type="toc">
<h2>Contents</h2>
<ol epub:type="list">
<li><a href="xhtml/title.xhtml#tit">Title Page</a></li>
<li><a href="xhtml/copyrightnotice.xhtml#notice">Copyright Notice</a></li>
<li><a href="xhtml/dedication.xhtml#ded">Dedication</a></li>
<li><a href="xhtml/acknowledgments.xhtml#ack">Acknowledgments</a></li>
<li><a href="xhtml/epigraph.xhtml#epi">Epigraph</a></li>
<li><a href="xhtml/prologue.xhtml#Pro">Prologue: Mars</a></li>
<li><a href="xhtml/chapter1.xhtml#ch1">One: Cambridge, Massachusetts, United Atlantic Federation, Earth</a></li>
<li><a href="xhtml/chapter2.xhtml#ch2">Two: Walton Spaceport, United Atlantic Federation, Earth</a></li>
<li><a href="xhtml/chapter3.xhtml#ch3">Three: Lowell City, Mars</a></li>
<li><a href="xhtml/chapter4.xhtml#ch4">Four: Luna City</a></li>
<li><a href="xhtml/chapter5.xhtml#ch5">Five: En Route to Mars</a></li>
<li><a href="xhtml/chapter6.xhtml#ch6">Six: Space Tunnel #1</a></li>
<li><a href="xhtml/chapter7.xhtml#ch7">Seven: Lowell City, Mars</a></li>
<li><a href="xhtml/chapter8.xhtml#ch8">Eight: World</a></li>
<li><a href="xhtml/chapter9.xhtml#ch9">Nine: Gofkit Shamloe</a></li>
<li><a href="xhtml/chapter10.xhtml#ch10">Ten: Lowell City, Mars</a></li>
<li><a href="xhtml/chapter11.xhtml#ch11">Eleven: Lowell City</a></li>
<li><a href="xhtml/chapter12.xhtml#ch12">Twelve: Gofkit Shamloe</a></li>
<li><a href="xhtml/chapter13.xhtml#ch13">Thirteen: Gofkit Shamloe</a></li>
<li><a href="xhtml/chapter14.xhtml#ch14">Fourteen: Tharsis, Mars</a></li>
<li><a href="xhtml/chapter15.xhtml#ch15">Fifteen: World</a></li>
<li><a href="xhtml/chapter16.xhtml#ch16">Sixteen: At Space Tunnel #438</a></li>
<li><a href="xhtml/chapter17.xhtml#ch17">Seventeen: At Space Tunnel #438</a></li>
<li><a href="xhtml/chapter18.xhtml#ch18">Eighteen: Lowell City, Mars</a></li>
<li><a href="xhtml/chapter19.xhtml#ch19">Nineteen: Aboard the Murasaki</a></li>
<li><a href="xhtml/chapter20.xhtml#ch20">Twenty: Aboard the Murasaki</a></li>
<li><a href="xhtml/chapter21.xhtml#ch21">Twenty-One: Aboard the Murasaki</a></li>
<li><a href="xhtml/chapter22.xhtml#ch22">Twenty-Two: Aboard the Murasaki</a></li>
<li><a href="xhtml/chapter23.xhtml#ch23">Twenty-Three: Tharsis, Mars</a></li>
<li><a href="xhtml/chapter24.xhtml#ch24">Twenty-Four: Caligula Space</a></li>
<li><a href="xhtml/chapter25.xhtml#ch25">Twenty-Five: Tharsis, Mars</a></li>
<li><a href="xhtml/chapter26.xhtml#ch26">Twenty-Six: Artemis System</a></li>
<li><a href="xhtml/chapter27.xhtml#ch27">Twenty-Seven: In Q Space</a></li>
<li><a href="xhtml/chapter28.xhtml#ch28">Twenty-Eight: Aboard a Faller Station</a></li>
<li><a href="xhtml/chapter29.xhtml#ch29">Twenty-Nine: Q Space</a></li>
<li><a href="xhtml/chapter30.xhtml#ch30">Thirty: Tharsis, Mars</a></li>
<li><a href="xhtml/chapter31.xhtml#ch31">Thirty-One: Space Tunnel #1</a></li>
<li><a href="xhtml/chapter32.xhtml#ch32">Thirty-Two: Tharsis Plain, Mars</a></li>
<li><a href="xhtml/chapter33.xhtml#ch33">Thirty-Three: Space Tunnel #1</a></li>
<li><a href="xhtml/chapter34.xhtml#ch34">Thirty-Four: Thera Station, Mars Orbit</a></li>
<li><a href="xhtml/abouttheauthor.xhtml#ata">About the Author</a></li>
<li><a href="xhtml/adcard.xhtml#add">By Nancy Kress</a></li>
<li><a href="xhtml/newsletter.xhtml#new">Newsletter Sign-up</a></li>
<li><a href="xhtml/copyright.xhtml#cpy">Copyright</a></li>
</ol>
</nav>
<nav epub:type="landmarks">
<h2>Guide</h2>
<ol epub:type="list">
<li><a epub:type="cover" href="xhtml/cover.xhtml">Cover</a></li>
<li><a epub:type="toc" href="xhtml/contents.xhtml">Table of Contents</a></li>
</ol>
</nav>
</body>
</html>