Multipath efect in <a href="https://en.wikipedia.org/wiki/GPS" class="extiw" title="w:GPS">GPS</a> signal. Green color indicates the direct path of the waves, the red color indicates reflected waves.
derivative work: <a href="//commons.wikimedia.org/wiki/User:Javiersanp" title="User:Javiersanp">Javiersanp</a>
<ul><li><a href="//commons.wikimedia.org/wiki/File:GPS_tracking_satellites.jpg" title="File:GPS tracking satellites.jpg">GPS tracking satellites.jpg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:Theonlysilentbob~commonswiki" title="User:Theonlysilentbob~commonswiki">Vaughan Weather</a></li>
<li>Navstar-2.jpg <i>by</i> <a href="https://en.wikipedia.org/wiki/NASA" class="extiw" title="w:NASA">NASA</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Canyon_midday.jpg" title="File:Canyon midday.jpg">Canyon midday.jpg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:Dual_Freq" title="User:Dual Freq">Realbrvhrt</a></li></ul>