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22 MARCH 2016 FOGHORN SAFETYMATTERS By Eric Christensen Director of Regulatory Affairs and Risk Management This Safety Alert is provided for informa- tional purposes only and does not relieve any domestic or international safety opera- tional or material requirement. Questions should be forwarded to the Coast Guard Navigation Center at 703-313-5900 or via email using the NAVCEN website http www.navcen.uscg.gov. D o you know what equipment relies upon the U.S. Global Positioning System GPS signal How would you respond if you lost the signal This past summer multiple outbound vessels from a non-U.S. port suddenly lost GPS signal reception. The net effect was various alarms and a loss of GPS input to the ships surface search radar gyro units and Electronic Chart Display Information System ECDIS resulting in no GPS data for position fixing radar over ground speed inputs gyro speed input and loss of collision avoidance capabilities on the radar display. Fortunately the vessels were able to safely continue their voyage using radar in heads up display magnetic compass and terrestrial navigation. Approximately 6nm later the vessels GPS units resumed operation.Although the vessels had back-up systems to allow a safe transit the consequences could have been severe. These types of events highlight the potential detri- mental impact to navigation caused by GPS interference or jamming and the importance in understanding how your vessels or facilitys equipment could be impacted by a loss of GPS signal. Whether walking through the city driving across town or navigating the world Global Navigation Satellite Systems GNSS have become an integral part of everyday life. However at times the positioning signals may be impacted by interference from both natural and human-made sources. The most common types of interference are reception issues usually due to bad in- stallations poor antenna positioning or Global Navigation Satellite Systems Trust But Verify and Report Disruptions MARINE GROUP B o a t w o r k s Marine Group Boat Works is the finest California boatbuilder and repairer of steel and aluminum high-speed ferries catamarans and passenger vessels up to 220 feet-long.Operating two shifts six days per week for fast turnarounds and minimized vessel time out-of-service.marinegroupbw.com leahmarinegroupbw.com 619 621-2220 NEXT GENERATION TAKINGPASSENGER VESSELSTOTHE Nowupgradingthe M.V.GeminiandtheM.V.Intintoli