A system for navigating a medical device within a body, comprising: an electronic control unit configured to: determine an operating position for a first electrical position sensor (44 1) on said medical device within a first coordinate system, said first coordinate system defined by an electric field based positioning system; determine an operating position for a first magnetic position sensor (46 1) on said medical device within a second coordinate system, said second coordinate system defined by a magnetic field based positioning system, said first magnetic position sensor (46 1) disposed proximate said first electrical position sensor (44 1); apply a first mapping function correlating said operating positions of said first electrical position sensor (44 1) and said first magnetic position sensor (46 1), said first mapping function generating a mapped position for said first magnetic position sensor (46 1) in said first coordinate system responsive to said operating position of said first magnetic position sensor (46 1) in said second coordinate system; and, determine a first adjusted operating position for said first electrical position sensor (44 1) in said first coordinate system responsive to said mapped position of said first magnetic position sensor (46 1). an electronic control unit configured to: determine an operating position for a first electrical position sensor (44 1) on said medical device within a first coordinate system, said first coordinate system defined by an electric field based positioning system; determine an operating position for a first magnetic position sensor (46 1) on said medical device within a second coordinate system, said second coordinate system defined by a magnetic field based positioning system, said first magnetic position sensor (46 1) disposed proximate said first electrical position sensor (44 1); apply a first mapping function correlating said operating positions of said first electrical position sensor (44 1) and said first magnetic position sensor (46 1), said first mapping function generating a mapped position for said first magnetic position sensor (46 1) in said first coordinate system responsive to said operating position of said first magnetic position sensor (46 1) in said second coordinate system; and, determine a first adjusted operating position for said first electrical position sensor (44 1) in said first coordinate system responsive to said mapped position of said first magnetic position sensor (46 1). determine an operating position for a first electrical position sensor (44 1) on said medical device within a first coordinate system, said first coordinate system defined by an electric field based positioning system; determine an operating position for a first magnetic position sensor (46 1) on said medical device within a second coordinate system, said second coordinate system defined by a magnetic field based positioning system, said first magnetic position sensor (46 1) disposed proximate said first electrical position sensor (44 1); apply a first mapping function correlating said operating positions of said first electrical position sensor (44 1) and said first magnetic position sensor (46 1), said first mapping function generating a mapped position for said first magnetic position sensor (46 1) in said first coordinate system responsive to said operating position of said first magnetic position sensor (46 1) in said second coordinate system; and, determine a first adjusted operating position for said first electrical position sensor (44 1) in said first coordinate system responsive to said mapped position of said first magnetic position sensor (46 1).