1. A system for determining a position of a medical device within a body, comprising: an electronic control unit configured to: receive a position signal from each of a plurality of position sensors of a first type disposed on the medical device and from at least one position sensor of a second type disposed on the medical device; apply a filter to each of said position signals to obtain filtered estimated positions for each of said plurality of position sensors of said first type and said at least one position sensor of said second type; compute a spline connecting said plurality of position sensors of said first type responsive to said filtered estimated positions for said plurality of positions sensors of said first type; estimate a spline position for said at least one position sensor of said second type along said spline; generate a first map between said spline position and said filtered estimated position of said at least one position sensor of said second type; generate a second map between said spline position and an unfiltered estimated position of said at least one position sensor of said second type; generate a composite map using said first and second maps; determine an actual position for one of said plurality of position sensors of said first type using said composite map and said filtered estimated position for said one of said plurality of position sensors of said first type; and a display communicatively coupled to the electronic control unit and configured and arranged to display the composite map overlaid with the actual position of said one of said plurality of position sensors of said first type.