The method 18 for use with first and second magnets associated with an indwelling medical device, the first and second magnets having first and second axes of magnetization, respectively, with the first and second axes of magnetization having a known orientation so as not to be aligned with respect to each other, the method further comprising calculating six degrees of freedom for the indwelling medical device based on the values of the position of {HEAD ~ the first and second magnets} in {TAIL ~ the three dimensional space} 
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The method 18 for use with first and second magnets associated with an indwelling medical device , the first and second magnets having first and second axes of magnetization , respectively , with the first and second axes of magnetization having a known orientation so as not to be aligned with respect to each other , the method further comprising calculating six degrees of freedom for the indwelling medical device based on the values of the position of { HEAD ~ the first and second magnets } in { TAIL ~ the three dimensional space }
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