"activity.html"><a href="activity.html#the-geographic-coordinate-system"><i class="fa fa-check"></i><b>6.2.1</b> The Geographic Coordinate System</a></li>
<li class="chapter" data-level="6.2.2" data-path="activity.html"><a href="activity.html#the-global-positioning-system"><i class="fa fa-check"></i><b>6.2.2</b> The Global Positioning System</a></li>
<li class="chapter" data-level="6.2.3" data-path="activity.html"><a href="activity.html#gps-based-activity-measures"><i class="fa fa-check"></i><b>6.2.3</b> GP