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<p>a device enters or leaves a particular area.Geopositioning is a pre-requisite for geofencing.</p>

<p><big>Background</big></p>
<p>Geopositioning uses various visual and <a href="page.php?w=Electronics">electronic</a> methods including <a href="page.php?w=position_line">position line</a>s and <a href="page.php?w=position_circle">position circle</a>s, <a href="page.php?w=celestial_navigation">celestial navigation</a>, <a href="page.php?w=radio_navigation">radio navigation</a>, <a href="page.php?w=Wi-Fi_positioning_system">radio and WiFi positioning systems</a>,</p><p>
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