1. A method for storing a trajectory of an object during a surgical procedure using a surgical navigation system, comprising: providing at least one pre-acquired image of a patient; tracking a three-dimensional trajectory of the object; displaying a first representation of the object's trajectory superimposed onto at least one pre-acquired image; receiving a command to store the object's trajectory; storing the object's trajectory; and superimposing a second representation of the object's stored trajectory onto at least one pre-acquired image.