NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2025072
SUBJ: SVN51 (PRN20) USABLE JDAY 281/1933 
1.     NANU TYPE: USABINIT
       NANU NUMBER: 2025072
       NANU DTG: 081937Z OCT 2025
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: 51
       PRN: 20
       START JDAY: 281
       START TIME ZULU: 1933
       START CALENDAR DATE: 08 OCT 2025
       STOP JDAY: N/A
       STOP TIME ZULU: N/A
       STOP CALENDAR DATE: N/A

2.  CONDITION: GPS SATELLITE SVN51 (PRN20) WAS USABLE AS OF JDAY 281
    (08 OCT 2025) BEGINNING 1933 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