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.


7/23/2018: 2018 Public Interface Control Working Group and Open Public Forum

The Global Positioning Systems Directorate has announced the 2018 Public Interface Control Working Group and Open Public Forum. The meeting will be held Sept. 12, 2018, at the TASC/Engility facility in El Segundo, California, and will be available through teleconference. The purpose of this meeting is to update the public on GPS public document revisions and collect issues/comments for analysis and possible integration into future GPS public document revisions.


7/3/2018: Is your Automated Identification System ready for Subchapter M?

During the month of June 2018, over 50 percent of towing vessels operating in U.S. waters transmitted incorrect AIS data, and an alarming number of these vessels did not accurately report their dimensions or broadcast a properly assigned MMSI number. This post provides guidance to owners/operators for verifying compliancy with AIS requirements as they work to attain a COI under Subchapter M.


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.


4/10/2018: Navigation Center 2017 Year in Review

The 2017 Year in Review highlights NAVCEN’s work with maritime stakeholders, interagency partners, and GPS users worldwide to modernize the delivery of Marine Safety Information.


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.


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