| http://www.w3.org/ns/prov#value | - In another example, a tracking system wherein the both the EM sensors 12 and the at least one complementary EM sensor 14 are formed from coil trios (e.g., the EM sensors 12 and the at last one complementary EM sensor 14 each having three coils), the at least one EM complementary sensor 14 may be tracked in six degrees of freedom to determine position and orientation, including the X, Y and Z coord
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