NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2025080
SUBJ: SVN57 (PRN29) FORECAST OUTAGE JDAY 352/2145 - JDAY 353/0945
1.     NANU TYPE: FCSTDV
       NANU NUMBER: 2025080
       NANU DTG: 121711Z DEC 2025
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: 57
       PRN: 29
       START JDAY: 352
       START TIME ZULU: 2145
       START CALENDAR DATE: 18 DEC 2025
       STOP JDAY: 353
       STOP TIME ZULU: 0945
       STOP CALENDAR DATE: 19 DEC 2025

2.  CONDITION: GPS SATELLITE SVN57 (PRN29) WILL BE UNUSABLE ON JDAY 352
    (18 DEC 2025) BEGINNING 2145 ZULU UNTIL JDAY 353 (19 DEC 2025)
    ENDING 0945 ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOV
    MILITARY - GPS WARFIGHTER COLLABORATION CELL at HTTPS://GWCC-WS.CCE.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2541, gpsoperationscenter@us.af.mil, HTTPS://GWCC-WS.CCE.AF.MIL 
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3526. COMM 805-606-3526.
   JSPOCCOMBATOPS@US.AF.MIL