Built-in automobile GPS systems often prove useful in an investigation primarily because they produce trails of evidence. Assuming the internal system or the GPS satellite creates a log of visited locations, an investigator could determine where the vehicle has been. For example, if the vehicle is stolen, investigators or law enforcement could geo-locate it to apprehend the thieves. Furthermore, records could help discern if the vehicle was involved in a crime, provided the GPS device was at the scene when the crime happened. As it concerns technologies that are theorized to develop in the future, forensic examination of GPS systems could become essential in the process of investigating particular crimes. For instance, if a self-driving car bases its navigation on its GPS coordinates, and someone manipulates the navigation by hacking the GPS, it would be advised that an analysis be conducted on the GPS system to determine the scope of the crime.