his location.</p>
<div class="figure" style="text-align: center"><span id="fig:nightcrawl"></span>
<img src="activity_files/figure-html/nightcrawl-1.png" alt="Nightly GPS-fluctuations, revealing inaccurate location measurements" width="100%" />
<p class="caption">
Figure 6.6: Nightly GPS-fluctuations, revealing inaccurate location measurements
</p>
</div>
</div>
<div id="gps-based-activity-measures" class="section level3">
<h3><span class="header-section-number">6.2.3</span> GPS-based Activity Measures</h3>