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<p>using <a href="page.php?w=radio_waves">radio waves</a> such as the <a href="page.php?w=Global_navigation_satellite_system">Global navigation satellite system</a> do not suffer ambient light, but still need line of sight.</p>

<p><big>Spatial scan</big></p>
<p>A spatial scan system uses (optical) beacons and sensors. Two categories can be distinguished:<br/>
* Inside out systems where the beacon is placed at a fixed position in the environment and the sensor is on the object<br/>
* Outside in systems where the beacons are on the target and the sensors</p><p>
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