This post provides information on the possible effects of the April 6, 2019 GPS Week Number Rollover on UTC derived from GPS devices.
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.
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.
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.
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.
Within the last year, the nationwide DGPS system has undergone a substantial reduction in the number of operational sites. Most of the sites are owned and maintained by USCG, but a few are owned and maintained by the U.S. Army Corps of Engineers (USACE). USACE will employ a phased shutdown of its five remaining DGPS sites. The 39 USCG owned and operated DGPS sites will continue to transmit.
Beginning Jan. 25, 2017, Air Force Space Command (AFSPC) will conduct a limited duration test implementing an increase of the L1 C/A power level on the GPS Block IIR-M and IIF satellites (19 vehicles).
The 56th Meeting of the Civil GPS Service Interface Committee (CGSIC), was held September 12-13, 2016, at the Oregon Convention Center in Portland, Oregon, in conjunction with the Institute Of Navigation’s Global Navigation Satellite System conference.