All CGSIC,

       The Air Force Second Space Operations Squadron (2 SOPS) has issued a LAUNCH NANU for SVN-74, the first of the new generation of GPS-III satellites.  To clear up any confusion this may have caused, SVN-74 was launched on 23 December of 2018, JDAY 357 2018, but there is no provision in a strictly formatted LAUNCH NANU to list a previous year.  The first of its kind, this satellite was launched outside of the GPS Ground Control Segment and has been under the operational control of the vehicle developer.  Having successfully undergone rigorous operational testing on orbit, SVN-74/PRN-04 is now being passed to 2 SOPS to begin Air Force testing for insertion into the active GPS constellation.  A LAUNCH NANU is required to initialize a GPS satellite's service in the Air Force. 

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2019159

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2019159

SUBJ: SVN74 (PRN04) LAUNCH JDAY 357

1. NANU TYPE: LAUNCH

       NANU NUMBER: 2019159

       NANU DTG: 100122Z OCT 2019

       SVN: 74

       PRN: 04

       LAUNCH JDAY: 357

       LAUNCH TIME ZULU: 1351

1. GPS SATELLITE SVN74 (PRN04) WAS LAUNCHED ON JDAY 357. 

   A USABINIT NANU WILL BE SENT WHEN THE SATELLITE IS SET ACTIVE TO SERVICE.

1. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV

   MILITARY - GPS OPERATIONS CENTER AT HTTPS://gps.afspc.af.mil/GPSOC, DSN 560-2541,

   COMM 719-567-2541, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTP://gps.afspc.af.mil/GPSOC/GPS

Rick Hamilton
CGSIC Executive Secretariat
GPS Information Analysis Team Lead
U.S. Coast Guard Navigation Center
703-313-5930