Determining and illustrating tracking system members

A method of sensing a position and generating a map, comprising:

• positioning a mapping instrument having a position element in a volume;
• positioning at least a first pair of axis generation electrodes on a surface of the volume;
• injecting a current between the first pair of axis generation electrodes to generate an axis current within the volume;
• determining a position of the mapping instrument;
• storing the determined position of the mapping instrument;
• displaying the determined position of the mapping instrument;
• and
• displaying a pseudo position of the axis electrodes on a display device relative to the determined position of the mapping instrument.

A method of sensing a position and generating a map, comprising:

• positioning a mapping instrument having a position element in a heart of an animal;
• positioning at least a first pair of axis generation electrodes on a surface of the animal at known locations;
• injecting a current between the first pair of axis generation electrodes to generate an axis current within the heart;
• determining a plurality of positions of the mapping instrument relative to the first pair of axis generation electrodes;
• displaying a map of the heart based on the determined plurality of positions of the mapping instrument;
• and
• determining a pseudo position of the first axis electrodes relative to the displayed map based on the plurality of determined positions of the mapping instrument relative to the axis generated between the axis electrodes;
• and
• displaying a pseudo position of the first axis electrodes on a display device relative to the determined position of the mapping instrument representing the known locations of the axis electrodes relative to the heart of the animal.