CGSIC Bulletin: SVN-77/PRN-14 Initial Use

All CGSIC,

GPS satellite SVN-77 (PRN-14) was set healthy for initial use on 02 December at 0131Z.  SVN-77 is the fourth of a new generation of GPS satellites and the 23rd satellite to broadcast L2C, the second civil GPS signal at 1227.6 MHz.  L2C is not yet designated as "Operational" by the U.S. Space Force.  However, the L2C signal is set to Healthy and users may utilize this signal at their own risk.  SVN-77 is the 16th satellite to begin broadcasting the third civil GPS signal, L5, specifically designed for aviation use in an internationally  protected band of spectrum designated for aeronautical navigation at 1176.45 MHz.  L5 continues to broadcast an Unhealthy designation.   SVN-77 is the fourth satellite broadcasting the new L1C signal at 1575.42 MHz.

The next GPS III satellite, SVN-78, initially scheduled to launch in January, reportedly will now launch no earlier than 01 July 2021.

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

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NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2020086

SUBJ: SVN77 (PRN14) USABLE JDAY 337/0107

1. NANU TYPE: USABINIT

       NANU NUMBER: 2020086

       NANU DTG: 020131Z DEC 2020

       REFERENCE NANU: N/A

       REF NANU DTG: N/A

       SVN: 77

       PRN: 14

       START JDAY: 337

       START TIME ZULU: 0107

       START CALENDAR DATE: 02 DEC 2020

       STOP JDAY: N/A

       STOP TIME ZULU: N/A

       STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS USABLE AS OF JDAY 337

   (02 DEC 2020) BEGINNING 0107 ZULU.

3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOV

   MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,

   COMM 719-567-2541, gpsoperationscenter@us.af.mil, HTTPS://GPS.AFSPC.AF.MIL

   MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3526. COMM 805-606-3526.

   JSPOCCOMBATOPS@US.AF.MIL