South Korea's government is working on establishing three sites for eLoran test operations by 2019 with further ones to follow after that. Pictured is a container ship off Busan
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 Two radio technology.
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.
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