122 ships, including Coast Guard vessels and a passenger vessel, have reported malfunctions in their navigation systems since the apparent jamming of satellite signals by North Korea last week, reported 'Safety4Sea'. According to the Coast Guard in Incheon, west of Seoul, a total of 122 ships were affected by the disruption to Global Positioning System (GPS) signals. Among the vessels were eight patrol boats belonging to the Coast Guard, a passenger liner carrying 387 people and a petrol products carrier. Fishing boats operating near the tense western maritime border with North Korea also reported errors in their navigation systems, although none of them led to accidents, Coast Guard officials said.