9/17/2018: Reports of GPS problems submitted by public now available on Navigation Center’s website

Reports of GPS problems submitted to Navigation Center through the webpage will be posted to the GPS Problem Report Status webpage after review by NAVCEN staff. Reports will be anonymized to protect the submitter’s personal information and any equipment manufacturer data. All reports made in 2018 are now available and prior years will be available in the future.


6/20/2018: GPS satellite maintenance

GPS users should be aware that there may be a short period of high Horizontal Dilution of Precision (HDOP) / Position Dilution of Precision (PDOP) in two locations June 22-23, 2018.


5/31/2018: Navigation Center visits European counterparts to discuss global satellite system information sharing

The EU is building Galileo, a Global Navigation Satellite System similar to the U.S. GPS, and their GSC has looked at NAVCEN as a model service center for civil GNSS. The bilateral talks are allowing and encouraging full cooperation between the two service centers and NAVCEN is sharing its 30 years of experience in representing civil users in the U.S. GPS program. The two service centers discussed their roles and respective responsibilities to support civil users of GPS and Galileo, along with how they can continue to improve the sharing of relevant navigation information.


5/7/2018: U.S. Maritime Advisory 2018-007 – GPS Interference in Eastern Mediterranean Sea

Maritime Commons is sharing the content of U.S. Maritime Advisory 2018-007 to notify our readers that multiple instances of significant GPS interference have been reported by vessels and aircraft operating in the Eastern Mediterranean Sea since March 18, 2018.


4/12/2018: Upcoming 2019 Global Positioning System week number rollover event

This post provides information on the possible effects of the April 6, 2019 GPS Week Number Rollover on UTC derived from GPS devices.


4/11/2018: GPS directorate proposes change to Navstar GPS control segment

The Navigation Center posted a notice to its website that the Global Positioning Systems Directorate will propose a change to the Navstar GPS Control Segment to User Support Community Interfaces (ICD-GPS-870), Interface Control Documents that will remove Section One from the GPS Operational Advisory.


1/23/2018: Air Force announces update to GPS ground control software

The U.S. Air Force recently released a memorandum to inform the GPS community of an update to the GPS ground control software that may impact some user equipment. The U.S. Air Force intends to reinstall the software update no earlier than March 1, 2018 to provide time for manufacturers to bring GPS receivers into compliance with the Interface Specification.


9/21/2017: Good navigation practices – How one vessel master managed safe navigation during a GPS outage

During the week of June 19, 2017 a vessel transiting the northeast portion of the Black Sea reported multiple instances of GPS interference. Approximately 20 other vessels in the same area appeared to experience similar interference. The master of the vessel knew to contact the U.S. Coast Guard Navigation Center (NAVCEN) to report GPS disruptions. The steps he took to maintain situational awareness and safe navigation are good examples of techniques mariners can use during such an event, and NAVCEN would like to share them with the maritime community.


9/5/2017: Public Interface Control Working Group

The GPS Program Office is considering the modification or removal of the Operational Advisories in RFC-351 for both the current and future ground control systems.


7/18/2017: Do you know how to report a GPS disruption?

The Coast Guard Navigation Center is encouraging mariners to review Marine Safety Alert 01-16 to re-familiarize themselves with the procedures to report a disruption and the actions they should take to mitigate the effects of a disruption, following a GPS disruption in the Black Sea in June.


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