NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2026040
SUBJ: SVN81 (PRN21) FORECAST OUTAGE SUMMARY JDAY 120/1601 - JDAY 120/2151
1.     NANU TYPE: FCSTSUMM
       NANU NUMBER: 2026040
       NANU DTG: 302158Z APR 2026
       REFERENCE NANU: 2026037
       REF NANU DTG: 241646Z APR 2026
       SVN: 81
       PRN: 21
       START JDAY: 120
       START TIME ZULU: 1601
       START CALENDAR DATE: 30 APR 2026
       STOP JDAY: 120
       STOP TIME ZULU: 2151
       STOP CALENDAR DATE: 30 APR 2026

2.  CONDITION: GPS SATELLITE SVN81 (PRN21) WAS UNUSABLE ON JDAY 120
    (30 APR 2026) BEGINNING 1601 ZULU UNTIL JDAY 120 (30 APR 2026)
    ENDING 2151 ZULU.

3.  POC: CIVILIAN - NAVCEN AT 866-944-5748, HTTPS://WWW.NAVCEN.USCG.GOV
    MILITARY - GLOBAL WARFIGHTER COLLABORATION CELL at HTTPS://GWCC-WS.CCE.AF.MIL/, DSN 560-2541,
    COMM 719-567-2541, gpsoperationscenter@us.af.mil, HTTPS://GWCC-WS.CCE.AF.MIL 
    MILITARY ALTERNATE - COMBINED SPACE OPERATIONS CENTER, DSN 276-3526, 
    COMM 805-605-3526, JSPOCCOMBATOPS@SPACEFORCE.MIL