NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2025004 SUBJ: SVN45 (PRN21) FORECAST OUTAGE JDAY 023/1900 - UNTIL FURTHER NOTICE 1. NANU TYPE: FCSTUUFN NANU NUMBER: 2025004 NANU DTG: 190259Z JAN 2025 REFERENCE NANU: N/A REF NANU DTG: N/A SVN: 45 PRN: 21 START JDAY: 023 START TIME ZULU: 1900 START CALENDAR DATE: 23 JAN 2025 STOP JDAY: UFN STOP TIME ZULU: N/A STOP CALENDAR DATE: N/A 2. CONDITION: GPS SATELLITE SVN45 (PRN21) WILL BE UNUSABLE NO EARLIER THAN JDAY 023 (23 JAN 2025) BEGINNING 1900 ZULU UNTIL FURTHER NOTICE. 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