Software and hardware used by ships are vulnerable to tracking, and even hijacking ships, according to a study by cybersecurity firm Pen Test Partners. Vulnerabilities are caused by satellite communications systems with insufficient protections that allow hackers to gain admin access. From this point, hackers can manipulate navigation and even penetrate the autopilot feature, giving the hacker remote control of the ship.
Source: Hackers Can Hijack, Sink Ships: Researchers | SecurityWeek.Com