South Korea has revived a project to build a backup ship navigation system that would be difficult to hack after a recent wave of GPS signal jamming attacks it blamed on North Korea disrupted fishing vessel operations, officials say.Global Positioning System (GPS) and other electronic navigation aids are vulnerable to signal loss from solar weather effects, radio and satellite interference and deliberate jamming.
South Korea, which says it has faced repeated attempts by the rival North to interfere with satellite signals, will award a 15 billion won ($13 million) contract this month to secure technology required to build an alternative land-based radio system called eLoran (enhanced LOng-RAnge Navigation), which it hopes will provide reliable alternative position and timing signals for navigation….
GPS vulnerability poses security and commercial risks, especially for ships whose crews are not familiar with traditional navigation techniques or using paper charts.The General Lighthouse Authorities of the UK and Ireland, which tried to pioneer an eLoran system in Europe, conducted simulated communications attacks on ships at sea and said the results “demonstrated the devastating effects of jamming on the ships’ electronic bridge systems”.The United States, Russia and India are all looking into deploying versions of eLoran, which sends a much stronger signal and is harder to jam, as backup.
Installing an eLoran receiver and antenna on a ship would cost thousands of dollars, although cheaper options could include incorporating eLoran systems into satnav devices, according to technical specialists.
Excerpts from South Korea Revives GPS Backup After Cyber Attack , euters, May 1, 2016