Fitters of space apparatus work on the GLONASS-M space navigation satellite inside an assembly workshop of the Reshetnev Information Satellite Systems company in the Siberian town of Zheleznogorsk, some 50 km (31 miles) northeast of Krasnoyarsk, April 2, 2014. REUTERS/Ilya Naymushin/File Photo
SEOUL/LONDON (Reuters) - 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.
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