The invention relates to assisting a user in moving an insertion element within an object. A three-dimensional (3D) position and 3D local shape of the insertion element are tracked within the object. Based on the tracked 3D position and 3D local shape of the insertion element, an insertion element representation (42"') representing the insertion element within the object in its 3D position and 3D local shape is generated. Furthermore at least two different markings (78) applied along the length of the insertion element representation (42"') representing indications of the local shape of the insertion element are provided. A display image (60") including the insertion element representation (42'") with the different markings (78) is displayed. Markings can for example include alternating ring-like structures (78) with alternating lighter and darker colors and/or different colors for the tip and the rest of the insertion element representation for improving 3D visualization of insertion elements.
