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== Methods ==
== Methods ==
Electromagnetic tracking requires an external source. It also does not work reliably in the presence of metallic objects, like metallic laptop computers like a Powerbook G4. A metallic laptop has to be at least a foot or two away from the tracking area so it doesn't interfere. Metallic objects cause jitter and drift.
Electromagnetic tracking requires an external source. It also does not work reliably in the presence of metallic objects, like metallic laptop computers like a Powerbook G4. A metallic laptop has to be at least a foot or two away from the tracking area so it doesn't interfere. Metallic objects cause jitter and drift.
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+Magnetic tracking is typically wired, but it does not have to be.