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, which 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, which it hopes will provide reliable alternative position and timing signals for navigation.