All CGSIC, GPS Testing Notice Concerning the GPS Week Number Rollover The Global Positioning System Directorate has released a Federal Register Notice announcing plans to execute a test in February 2019 to investigate legacy receiver week roll-over behavior and analyze any off-nominal behavior exhibited. The Global Positioning System (GPS) week number rollover occurs in the GPS legacy navigation (LNAV) message every 1024 weeks due to the GPS week number being represented by only 10 […]

All CGSIC, High Horizontal Dilution of Precision (HDOP) Advisory for 24 – 25 January 2019 Users of the Global Positioning System (GPS) near Verkhnetoyemskiy Rayon, Arkhangelsk Oblast, Russia, may experience short periods of high HDOP/PDOP (HDOP greater than 6) between 241445Z and 250245Z January 2019 due to satellite maintenance (see NANU 2019010 below). View the analysis provided by the GPS Operations Center on NAVCEN's web page.  NOTICE ADVISORY TO NAVSTAR USERS […]

  All CGSIC, Upcoming Global Positioning System Week Number Rollover Event - April 6, 2019 In April 2018 the CGSIC announced the Department of Homeland Security release of the memorandum titled U.S. Owners and Operators Using GPS to Obtain Time (https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf) which is intended to provide an understanding of the possible effects of the April 6, 2019 GPS Week Number Rollover on Coordinated Universal Time derived from […]

All CGSIC, NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2019001 NANU TYPE: GENERAL *** GENERAL MESSAGE TO ALL GPS USERS *** GPS III SVN74 (PRN04) WAS LAUNCHED ON 23 DEC 2018 (2018 JDAY 357) AT 1351 ZULU. THIS SATELLITE WILL UNDERGO EXTENSIVE ON-ORBIT CHECK OUT AND TESTING PRIOR TO BEING SET HEALTHY. A USABINIT NANU WILL BE SENT WHEN THE SATELLITE IS SET ACTIVE TO SERVICE. *** GENERAL MESSAGE TO ALL GPS USERS ***   POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOVMILITARY […]

All CGSIC, GPS III Space Vehicle 01 Launch scheduled for 18 December 2018 Space and Missile Systems Center Los Angeles AFBPublished on Dec 12, 2018 There’s an excitement in the air.  Can you feel it? For the past seven weeks, we’ve provided you a “behind the scenes” look of what it takes to prepare for the inaugural launch of GPS III Space Vehicle 01, also known as “Vespucci.” […]