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* [[AC magnetic tracking]] (Polhemus)
* [[AC magnetic tracking]] (Polhemus)
* pulsed DC magnetic tracking (Used by Ascension, later NDI)
* pulsed DC magnetic tracking (Used by Ascension, later NDI)
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==Industry Standard Coil Architecture==
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[[File:EM tracker coil.png|thumb|An ISCA coil]]
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'''Industry Standard Coil Architecture''' is the use of three colocated orthogonal quasi-dipole transmitter coils and three colocated quasi-dipole receiver coils.<ref name="f611">{{cite web | title=System and method for electromagnetic tracking operable with multiple coil architectures | website=Google Patents | date=2003-09-24 | url=https://patents.google.com/patent/US8354837B2 | access-date=2024-08-22}}</ref>
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Examples of this type of system are:
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* [[Polhemus Viper]]
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* [[Polhemus Fastrak]]
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* [[Polhemus Patriot]]
==References==
==References==