The risk of cyber attacks targeting ships' satellite navigation is pushing nations to delve back through history and develop back-up systems with roots in World War II radio technology, according to Reuters.
Ships use GPS (Global Positioning System) and other similar devices that rely on sending and receiving satellite signals, which many experts say are vulnerable to jamming by hackers.
South Korea is developing an alternative system using an earth-based navigation technology known as eLoran, while the United States is planning to follow suit. Britain and Russia have also explored adopting versions of the technology, which works on radio signals.
"My own view, and it is only my view, is we are too dependent on GNSS/GPS position fixing systems," said Grant Laversuch, head of safety management at P&O Ferries. "Good navigation is about cross-checking navigation systems, and what better way than having two independent electronic systems."
The US Congress is also trying to promote legislation to install such system on US ship as a backup to GPS.