A system for applying an element to a body, wherein the position of a device for preparing and/or producing a connection between said body and said element relative to the position of said body is detected, it also relating to a system for applying an element to a body comprising a device for preparing and/or producing a connection between said element and said body and a position detection device for detecting the position of said device, for preparing and/or producing a connection between said element and said body, and for detecting said position of said body.