The present invention relates to a kind of navigation aid systems for assisting navigating to the intervention apparatus within subject. Implantation object open mould (21) and vascular open mould (27) are generated based on provided intervention image data set, wherein the model defines respective positions, shape and size in reference system. These models and position are also provided in reference system and optionally there are also the shapes (25) of intervention apparatus for generating the provided position and the graphical representation of optional shape that show implantation object open mould, vascular open mould and the intervention apparatus, to be physician provided direction, this allows doctor relatively easily to navigate intervention apparatus, so that intervention apparatus is moved through the opening that implantation object is open and passes through vascular.
