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19 Jan 2022
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19 Jan 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022002 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
On approximately 20 JAN 2022, SVN41 will resume transmitting L-band utilizing PRN22.On 20 JAN 2022, after 2200Z, GPS will transition SVN41 (PRN22) into the broadcast almanac for all satellites:- The almanac transition, accomplished one satellite at a time, will require approximately 24 hours to complete- Before, during, and after transition SVN41 (PRN22) will remain unusable until further notice- Future NANUs will notify users of any changes to the above stated status
*** GENERAL MESSAGE TO ALL GPS USERS ***

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


18 Jan 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022001
SUBJ: SVN47 (PRN22) DECOMMISSIONING JDAY 018/2200
1. NANU TYPE: DECOM
NANU NUMBER: 2022001
NANU DTG: 182156Z JAN 2022
REFERENCE NANU: 2021058
REF NANU DTG: 021637Z DEC 2021
SVN: 47
PRN: 22
UNUSABLE START JDAY: 336
UNUSABLE START TIME ZULU: 1637
UNUSABLE START CALENDAR DATE: 02 DEC 2021
DECOMMISSIONING START JDAY: 018
DECOMMISSIONING START TIME ZULU: 2200
DECOMMISSIONING START CALENDAR DATE: 18 JAN 2022

2. CONDITION: GPS SATELLITE SVN47 (PRN22) WAS UNUSABLE AS OF JDAY 336 (02 DEC 2021)
AND REMOVED FROM THE GPS CONSTELLATION ON JDAY 018 (18 JAN 2022).

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


27 Dec 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021062
SUBJ: SVN66 (PRN27) FORECAST OUTAGE SUMMARY JDAY 349/1925 - JDAY 361/1828
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021062
NANU DTG: 271829Z DEC 2021
REFERENCE NANU: 2021061
REF NANU DTG: 101936Z DEC 2021
SVN: 66
PRN: 27
START JDAY: 349
START TIME ZULU: 1925
START CALENDAR DATE: 15 DEC 2021
STOP JDAY: 361
STOP TIME ZULU: 1828
STOP CALENDAR DATE: 27 DEC 2021

2. CONDITION: GPS SATELLITE SVN66 (PRN27) WAS UNUSABLE ON JDAY 349
(15 DEC 2021) BEGINNING 1925 ZULU UNTIL JDAY 361 (27 DEC 2021)
ENDING 1828 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


10 Dec 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021061
SUBJ: SVN66 (PRN27) FORECAST OUTAGE JDAY 349/1900 - JDAY 363/1900
1. NANU TYPE: FCSTMX
NANU NUMBER: 2021061
NANU DTG: 101936Z DEC 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 66
PRN: 27
START JDAY: 349
START TIME ZULU: 1900
START CALENDAR DATE: 15 DEC 2021
STOP JDAY: 363
STOP TIME ZULU: 1900
STOP CALENDAR DATE: 29 DEC 2021

2. CONDITION: GPS SATELLITE SVN66 (PRN27) WILL BE UNUSABLE ON JDAY 349
(15 DEC 2021) BEGINNING 1900 ZULU UNTIL JDAY 363 (29 DEC 2021)
ENDING 1900 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


09 Dec 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021060
SUBJ: SVN61 (PRN02) FORECAST OUTAGE SUMMARY JDAY 343/1304 - JDAY 343/1934
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021060
NANU DTG: 091939Z DEC 2021
REFERENCE NANU: 2021057
REF NANU DTG: 011645Z DEC 2021
SVN: 61
PRN: 02
START JDAY: 343
START TIME ZULU: 1304
START CALENDAR DATE: 09 DEC 2021
STOP JDAY: 343
STOP TIME ZULU: 1934
STOP CALENDAR DATE: 09 DEC 2021

2. CONDITION: GPS SATELLITE SVN61 (PRN02) WAS UNUSABLE ON JDAY 343
(09 DEC 2021) BEGINNING 1304 ZULU UNTIL JDAY 343 (09 DEC 2021)
ENDING 1934 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


03 Dec 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021059
SUBJ: SVN57 (PRN29) FORECAST OUTAGE SUMMARY JDAY 337/0358 - JDAY 337/0931
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021059
NANU DTG: 030951Z DEC 2021
REFERENCE NANU: 2021056
REF NANU DTG: 291607Z NOV 2021
SVN: 57
PRN: 29
START JDAY: 337
START TIME ZULU: 0358
START CALENDAR DATE: 03 DEC 2021
STOP JDAY: 337
STOP TIME ZULU: 0931
STOP CALENDAR DATE: 03 DEC 2021

2. CONDITION: GPS SATELLITE SVN57 (PRN29) WAS UNUSABLE ON JDAY 337
(03 DEC 2021) BEGINNING 0358 ZULU UNTIL JDAY 337 (03 DEC 2021)
ENDING 0931 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


02 Dec 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021058
SUBJ: SVN47 (PRN22) UNUSABLE JDAY 336/1637 - UNTIL FURTHER NOTICE
1. NANU TYPE: UNUSUFN
NANU NUMBER: 2021058
NANU DTG: 021637Z DEC 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 47
PRN: 22
START JDAY: 336
START TIME ZULU: 1637
START CALENDAR DATE: 02 DEC 2021
STOP JDAY: UFN
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN47 (PRN22) WAS UNUSABLE ON JDAY 336
(02 DEC 2021) BEGINNING 1637 ZULU UNTIL FURTHER NOTICE.

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


01 Dec 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021057
SUBJ: SVN61 (PRN02) FORECAST OUTAGE JDAY 343/1245 - JDAY 344/0045
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021057
NANU DTG: 011645Z DEC 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 61
PRN: 02
START JDAY: 343
START TIME ZULU: 1245
START CALENDAR DATE: 09 DEC 2021
STOP JDAY: 344
STOP TIME ZULU: 0045
STOP CALENDAR DATE: 10 DEC 2021

2. CONDITION: GPS SATELLITE SVN61 (PRN02) WILL BE UNUSABLE ON JDAY 343
(09 DEC 2021) BEGINNING 1245 ZULU UNTIL JDAY 344 (10 DEC 2021)
ENDING 0045 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


29 Nov 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021056
SUBJ: SVN57 (PRN29) FORECAST OUTAGE JDAY 337/0300 - JDAY 337/1500
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021056
NANU DTG: 291607Z NOV 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 57
PRN: 29
START JDAY: 337
START TIME ZULU: 0300
START CALENDAR DATE: 03 DEC 2021
STOP JDAY: 337
STOP TIME ZULU: 1500
STOP CALENDAR DATE: 03 DEC 2021

2. CONDITION: GPS SATELLITE SVN57 (PRN29) WILL BE UNUSABLE ON JDAY 337
(03 DEC 2021) BEGINNING 0300 ZULU UNTIL JDAY 337 (03 DEC 2021)
ENDING 1500 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


15 Nov 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021055
SUBJ: SVN56 (PRN16) FORECAST OUTAGE SUMMARY JDAY 319/2053 - JDAY 320/0146
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021055
NANU DTG: 160148Z NOV 2021
REFERENCE NANU: 2021053
REF NANU DTG: 082028Z NOV 2021
SVN: 56
PRN: 16
START JDAY: 319
START TIME ZULU: 2053
START CALENDAR DATE: 15 NOV 2021
STOP JDAY: 320
STOP TIME ZULU: 0146
STOP CALENDAR DATE: 16 NOV 2021

2. CONDITION: GPS SATELLITE SVN56 (PRN16) WAS UNUSABLE ON JDAY 319
(15 NOV 2021) BEGINNING 2053 ZULU UNTIL JDAY 320 (16 NOV 2021)
ENDING 0146 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


08 Nov 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021054
SUBJ: SVN69 (PRN03) FORECAST OUTAGE SUMMARY JDAY 300/1635 - JDAY 312/2124
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021054
NANU DTG: 082122Z NOV 2021
REFERENCE NANU: 2021052
REF NANU DTG: 251957Z OCT 2021
SVN: 69
PRN: 03
START JDAY: 300
START TIME ZULU: 1635
START CALENDAR DATE: 27 OCT 2021
STOP JDAY: 312
STOP TIME ZULU: 2124
STOP CALENDAR DATE: 08 NOV 2021

2. CONDITION: GPS SATELLITE SVN69 (PRN03) WAS UNUSABLE ON JDAY 300
(27 OCT 2021) BEGINNING 1635 ZULU UNTIL JDAY 312 (08 NOV 2021)
ENDING 2124 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


08 Nov 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021053
SUBJ: SVN56 (PRN16) FORECAST OUTAGE JDAY 319/2015 - JDAY 320/0815
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021053
NANU DTG: 082028Z NOV 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 56
PRN: 16
START JDAY: 319
START TIME ZULU: 2015
START CALENDAR DATE: 15 NOV 2021
STOP JDAY: 320
STOP TIME ZULU: 0815
STOP CALENDAR DATE: 16 NOV 2021

2. CONDITION: GPS SATELLITE SVN56 (PRN16) WILL BE UNUSABLE ON JDAY 319
(15 NOV 2021) BEGINNING 2015 ZULU UNTIL JDAY 320 (16 NOV 2021)
ENDING 0815 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


25 Oct 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021052
SUBJ: SVN69 (PRN03) FORECAST OUTAGE JDAY 300/1500 - JDAY 314/1500
1. NANU TYPE: FCSTMX
NANU NUMBER: 2021052
NANU DTG: 251957Z OCT 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 69
PRN: 03
START JDAY: 300
START TIME ZULU: 1500
START CALENDAR DATE: 27 OCT 2021
STOP JDAY: 314
STOP TIME ZULU: 1500
STOP CALENDAR DATE: 10 NOV 2021

2. CONDITION: GPS SATELLITE SVN69 (PRN03) WILL BE UNUSABLE ON JDAY 300
(27 OCT 2021) BEGINNING 1500 ZULU UNTIL JDAY 314 (10 NOV 2021)
ENDING 1500 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


24 Sep 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021051
SUBJ: SVN62 (PRN25) FORECAST OUTAGE SUMMARY JDAY 267/0342 - JDAY 267/0856
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021051
NANU DTG: 240904Z SEP 2021
REFERENCE NANU: 2021050
REF NANU DTG: 171642Z SEP 2021
SVN: 62
PRN: 25
START JDAY: 267
START TIME ZULU: 0342
START CALENDAR DATE: 24 SEP 2021
STOP JDAY: 267
STOP TIME ZULU: 0856
STOP CALENDAR DATE: 24 SEP 2021

2. CONDITION: GPS SATELLITE SVN62 (PRN25) WAS UNUSABLE ON JDAY 267
(24 SEP 2021) BEGINNING 0342 ZULU UNTIL JDAY 267 (24 SEP 2021)
ENDING 0856 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


17 Sep 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021050
SUBJ: SVN62 (PRN25) FORECAST OUTAGE JDAY 267/0315 - JDAY 267/1515
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021050
NANU DTG: 171642Z SEP 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 62
PRN: 25
START JDAY: 267
START TIME ZULU: 0315
START CALENDAR DATE: 24 SEP 2021
STOP JDAY: 267
STOP TIME ZULU: 1515
STOP CALENDAR DATE: 24 SEP 2021

2. CONDITION: GPS SATELLITE SVN62 (PRN25) WILL BE UNUSABLE ON JDAY 267
(24 SEP 2021) BEGINNING 0315 ZULU UNTIL JDAY 267 (24 SEP 2021)
ENDING 1515 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


02 Sep 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021049
SUBJ: SVN66 (PRN27) FORECAST OUTAGE SUMMARY JDAY 245/1047 - JDAY 245/1802
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021049
NANU DTG: 021753Z SEP 2021
REFERENCE NANU: 2021048
REF NANU DTG: 261408Z AUG 2021
SVN: 66
PRN: 27
START JDAY: 245
START TIME ZULU: 1047
START CALENDAR DATE: 02 SEP 2021
STOP JDAY: 245
STOP TIME ZULU: 1802
STOP CALENDAR DATE: 02 SEP 2021

2. CONDITION: GPS SATELLITE SVN66 (PRN27) WAS UNUSABLE ON JDAY 245
(02 SEP 2021) BEGINNING 1047 ZULU UNTIL JDAY 245 (02 SEP 2021)
ENDING 1802 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


26 Aug 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021048
SUBJ: SVN66 (PRN27) FORECAST OUTAGE JDAY 245/1030 - JDAY 245/2230
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021048
NANU DTG: 261408Z AUG 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 66
PRN: 27
START JDAY: 245
START TIME ZULU: 1030
START CALENDAR DATE: 02 SEP 2021
STOP JDAY: 245
STOP TIME ZULU: 2230
STOP CALENDAR DATE: 02 SEP 2021

2. CONDITION: GPS SATELLITE SVN66 (PRN27) WILL BE UNUSABLE ON JDAY 245
(02 SEP 2021) BEGINNING 1030 ZULU UNTIL JDAY 245 (02 SEP 2021)
ENDING 2230 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


19 Aug 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021047
SUBJ: SVN74 (PRN04) UNUSABLE JDAY 231/0400 - JDAY 231/0917
1. NANU TYPE: UNUSABLE
NANU NUMBER: 2021047
NANU DTG: 190905Z AUG 2021
REFERENCE NANU: 2021046
REF NANU DTG: 190605Z AUG 2021
SVN: 74
PRN: 04
START JDAY: 231
START TIME ZULU: 0400
START CALENDAR DATE: 19 AUG 2021
STOP JDAY: 231
STOP TIME ZULU: 0917
STOP CALENDAR DATE: 19 AUG 2021

2. CONDITION: GPS SATELLITE SVN74 (PRN04) WAS UNUSABLE ON JDAY 231
(19 AUG 2021) BEGINNING 0400 ZULU UNTIL JDAY 231 (19 AUG 2021)
ENDING 0917 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


19 Aug 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021046
SUBJ: SVN74 (PRN04) UNUSABLE JDAY 231/0400 - UNTIL FURTHER NOTICE
1. NANU TYPE: UNUSUFN
NANU NUMBER: 2021046
NANU DTG: 190605Z AUG 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 74
PRN: 04
START JDAY: 231
START TIME ZULU: 0400
START CALENDAR DATE: 19 AUG 2021
STOP JDAY: UFN
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN74 (PRN04) WAS UNUSABLE ON JDAY 231
(19 AUG 2021) BEGINNING 0400 ZULU UNTIL FURTHER NOTICE.

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


06 Aug 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021045
SUBJ: SVN69 (PRN03) FORECAST OUTAGE SUMMARY JDAY 218/0200 - JDAY 218/0829
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021045
NANU DTG: 060830Z AUG 2021
REFERENCE NANU: 2021043
REF NANU DTG: 291657Z JUL 2021
SVN: 69
PRN: 03
START JDAY: 218
START TIME ZULU: 0200
START CALENDAR DATE: 06 AUG 2021
STOP JDAY: 218
STOP TIME ZULU: 0829
STOP CALENDAR DATE: 06 AUG 2021

2. CONDITION: GPS SATELLITE SVN69 (PRN03) WAS UNUSABLE ON JDAY 218
(06 AUG 2021) BEGINNING 0200 ZULU UNTIL JDAY 218 (06 AUG 2021)
ENDING 0829 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


30 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021044
SUBJ: SVN77 (PRN14) FORECAST OUTAGE SUMMARY JDAY 211/0635 - JDAY 211/1220
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021044
NANU DTG: 301229Z JUL 2021
REFERENCE NANU: 2021041
REF NANU DTG: 221532Z JUL 2021
SVN: 77
PRN: 14
START JDAY: 211
START TIME ZULU: 0635
START CALENDAR DATE: 30 JUL 2021
STOP JDAY: 211
STOP TIME ZULU: 1220
STOP CALENDAR DATE: 30 JUL 2021

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS UNUSABLE ON JDAY 211
(30 JUL 2021) BEGINNING 0635 ZULU UNTIL JDAY 211 (30 JUL 2021)
ENDING 1220 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


29 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021043
SUBJ: SVN69 (PRN03) FORECAST OUTAGE JDAY 218/0145 - JDAY 218/1345
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021043
NANU DTG: 291657Z JUL 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 69
PRN: 03
START JDAY: 218
START TIME ZULU: 0145
START CALENDAR DATE: 06 AUG 2021
STOP JDAY: 218
STOP TIME ZULU: 1345
STOP CALENDAR DATE: 06 AUG 2021

2. CONDITION: GPS SATELLITE SVN69 (PRN03) WILL BE UNUSABLE ON JDAY 218
(06 AUG 2021) BEGINNING 0145 ZULU UNTIL JDAY 218 (06 AUG 2021)
ENDING 1345 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


22 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021042
SUBJ: SVN50 (PRN05) FORECAST OUTAGE SUMMARY JDAY 203/1631 - JDAY 203/2246
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021042
NANU DTG: 222250Z JUL 2021
REFERENCE NANU: 2021040
REF NANU DTG: 161547Z JUL 2021
SVN: 50
PRN: 05
START JDAY: 203
START TIME ZULU: 1631
START CALENDAR DATE: 22 JUL 2021
STOP JDAY: 203
STOP TIME ZULU: 2246
STOP CALENDAR DATE: 22 JUL 2021

2. CONDITION: GPS SATELLITE SVN50 (PRN05) WAS UNUSABLE ON JDAY 203
(22 JUL 2021) BEGINNING 1631 ZULU UNTIL JDAY 203 (22 JUL 2021)
ENDING 2246 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


16 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021040

SUBJ: SVN50 (PRN05) FORECAST OUTAGE JDAY 203/1630 - JDAY 204/0430

1. NANU TYPE: FCSTDV

NANU NUMBER: 2021040

NANU DTG: 161547Z JUL 2021

REFERENCE NANU: N/A

REF NANU DTG: N/A

SVN: 50

PRN: 05

START JDAY: 203

START TIME ZULU: 1630

START CALENDAR DATE: 22 JUL 2021

STOP JDAY: 204

STOP TIME ZULU: 0430

STOP CALENDAR DATE: 23 JUL 2021



2. CONDITION: GPS SATELLITE SVN50 (PRN05) WILL BE UNUSABLE ON JDAY 203

(22 JUL 2021) BEGINNING 1630 ZULU UNTIL JDAY 204 (23 JUL 2021)

ENDING 0430 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


15 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021039
SUBJ: SVN51 (PRN20) FORECAST OUTAGE SUMMARY JDAY 196/1525 - JDAY 196/2151
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021039
NANU DTG: 152154Z JUL 2021
REFERENCE NANU: 2021037
REF NANU DTG: 072009Z JUL 2021
SVN: 51
PRN: 20
START JDAY: 196
START TIME ZULU: 1525
START CALENDAR DATE: 15 JUL 2021
STOP JDAY: 196
STOP TIME ZULU: 2151
STOP CALENDAR DATE: 15 JUL 2021

2. CONDITION: GPS SATELLITE SVN51 (PRN20) WAS UNUSABLE ON JDAY 196
(15 JUL 2021) BEGINNING 1525 ZULU UNTIL JDAY 196 (15 JUL 2021)
ENDING 2151 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


09 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021038
SUBJ: SVN67 (PRN06) FORECAST OUTAGE SUMMARY JDAY 190/0610 - JDAY 190/1327
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021038
NANU DTG: 091330Z JUL 2021
REFERENCE NANU: 2021036
REF NANU DTG: 011522Z JUL 2021
SVN: 67
PRN: 06
START JDAY: 190
START TIME ZULU: 0610
START CALENDAR DATE: 09 JUL 2021
STOP JDAY: 190
STOP TIME ZULU: 1327
STOP CALENDAR DATE: 09 JUL 2021

2. CONDITION: GPS SATELLITE SVN67 (PRN06) WAS UNUSABLE ON JDAY 190
(09 JUL 2021) BEGINNING 0610 ZULU UNTIL JDAY 190 (09 JUL 2021)
ENDING 1327 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


07 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021037
SUBJ: SVN51 (PRN20) FORECAST OUTAGE JDAY 196/1515 - JDAY 197/0315
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021037
NANU DTG: 072009Z JUL 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 51
PRN: 20
START JDAY: 196
START TIME ZULU: 1515
START CALENDAR DATE: 15 JUL 2021
STOP JDAY: 197
STOP TIME ZULU: 0315
STOP CALENDAR DATE: 16 JUL 2021

2. CONDITION: GPS SATELLITE SVN51 (PRN20) WILL BE UNUSABLE ON JDAY 196
(15 JUL 2021) BEGINNING 1515 ZULU UNTIL JDAY 197 (16 JUL 2021)
ENDING 0315 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


01 Jul 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021036
SUBJ: SVN67 (PRN06) FORECAST OUTAGE JDAY 190/0545 - JDAY 190/1745
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021036
NANU DTG: 011522Z JUL 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 67
PRN: 06
START JDAY: 190
START TIME ZULU: 0545
START CALENDAR DATE: 09 JUL 2021
STOP JDAY: 190
STOP TIME ZULU: 1745
STOP CALENDAR DATE: 09 JUL 2021

2. CONDITION: GPS SATELLITE SVN67 (PRN06) WILL BE UNUSABLE ON JDAY 190
(09 JUL 2021) BEGINNING 0545 ZULU UNTIL JDAY 190 (09 JUL 2021)
ENDING 1745 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


23 Jun 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021035

SUBJ: SVN44 (PRN28) DECOMMISSIONING JDAY 174/2200

1. NANU TYPE: DECOM

NANU NUMBER: 2021035

NANU DTG: 232310Z JUN 2021

REFERENCE NANU: 2021033

REF NANU DTG: 162036Z JUN 2021

SVN: 44

PRN: 28

UNUSABLE START JDAY: 172

UNUSABLE START TIME ZULU: 1725

UNUSABLE START CALENDAR DATE: 21 JUN 2021

DECOMMISSIONING START JDAY: 174

DECOMMISSIONING START TIME ZULU: 2200

DECOMMISSIONING START CALENDAR DATE: 23 JUN 2021



2. CONDITION: GPS SATELLITE SVN44 (PRN28) WAS UNUSABLE AS OF JDAY 172 (21 JUN 2021)

AND REMOVED FROM THE GPS CONSTELLATION ON JDAY 174 (23 JUN 2021).



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


22 Jun 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021034

SUBJ: SVN78 (PRN11) LAUNCH JDAY 168

1. NANU TYPE: LAUNCH

NANU NUMBER: 2021034

NANU DTG: 222331Z JUN 2021

SVN: 78

PRN: 11

LAUNCH JDAY: 168

LAUNCH TIME ZULU: 1609



2. GPS SATELLITE SVN78 (PRN11) WAS LAUNCHED ON JDAY 168.

A USABINIT NANU WILL BE SENT WHEN THE SATELLITE IS SET ACTIVE TO SERVICE.



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

MILITARY - GPS OPERATIONS CENTER AT HTTPS://gps.afspc.af.mil/gpsoc, DSN 560-2541,

COMM 719-567-2541, HTTPS://gps.afspc.af.mil/gpsoc

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

JSPOCCOMBATOPS@US.AF.MIL


16 Jun 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021033
SUBJ: SVN44 (PRN28) FORECAST OUTAGE JDAY 172/1700 - UNTIL FURTHER NOTICE
1. NANU TYPE: FCSTUUFN
NANU NUMBER: 2021033
NANU DTG: 162036Z JUN 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 44
PRN: 28
START JDAY: 172
START TIME ZULU: 1700
START CALENDAR DATE: 21 JUN 2021
STOP JDAY: UFN
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN44 (PRN28) WILL BE UNUSABLE NO EARLIER THAN JDAY 172
(21 JUN 2021) BEGINNING 1700 ZULU UNTIL FURTHER NOTICE.

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


10 Jun 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021032
SUBJ: SVN52 (PRN31) FORECAST OUTAGE SUMMARY JDAY 161/2013 - JDAY 162/0352
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021032
NANU DTG: 110355Z JUN 2021
REFERENCE NANU: 2021031
REF NANU DTG: 011440Z JUN 2021
SVN: 52
PRN: 31
START JDAY: 161
START TIME ZULU: 2013
START CALENDAR DATE: 10 JUN 2021
STOP JDAY: 162
STOP TIME ZULU: 0352
STOP CALENDAR DATE: 11 JUN 2021

2. CONDITION: GPS SATELLITE SVN52 (PRN31) WAS UNUSABLE ON JDAY 161
(10 JUN 2021) BEGINNING 2013 ZULU UNTIL JDAY 162 (11 JUN 2021)
ENDING 0352 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


01 Jun 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021031

SUBJ: SVN52 (PRN31) FORECAST OUTAGE JDAY 161/1945 - JDAY 162/0745

1. NANU TYPE: FCSTDV

NANU NUMBER: 2021031

NANU DTG: 011440Z JUN 2021

REFERENCE NANU: N/A

REF NANU DTG: N/A

SVN: 52

PRN: 31

START JDAY: 161

START TIME ZULU: 1945

START CALENDAR DATE: 10 JUN 2021

STOP JDAY: 162

STOP TIME ZULU: 0745

STOP CALENDAR DATE: 11 JUN 2021



2. CONDITION: GPS SATELLITE SVN52 (PRN31) WILL BE UNUSABLE ON JDAY 161

(10 JUN 2021) BEGINNING 1945 ZULU UNTIL JDAY 162 (11 JUN 2021)

ENDING 0745 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


28 May 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021030
SUBJ: SVN47 (PRN22) FORECAST OUTAGE SUMMARY JDAY 148/0059 - JDAY 148/0700
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021030
NANU DTG: 280658Z MAY 2021
REFERENCE NANU: 2021028
REF NANU DTG: 182006Z MAY 2021
SVN: 47
PRN: 22
START JDAY: 148
START TIME ZULU: 0059
START CALENDAR DATE: 28 MAY 2021
STOP JDAY: 148
STOP TIME ZULU: 0700
STOP CALENDAR DATE: 28 MAY 2021

2. CONDITION: GPS SATELLITE SVN47 (PRN22) WAS UNUSABLE ON JDAY 148
(28 MAY 2021) BEGINNING 0059 ZULU UNTIL JDAY 148 (28 MAY 2021)
ENDING 0700 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


20 May 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021029

SUBJ: SVN44 (PRN28) FORECAST OUTAGE SUMMARY JDAY 140/1254 - JDAY 140/2047

1. NANU TYPE: FCSTSUMM

NANU NUMBER: 2021029

NANU DTG: 202048Z MAY 2021

REFERENCE NANU: 2021027

REF NANU DTG: 121907Z MAY 2021

SVN: 44

PRN: 28

START JDAY: 140

START TIME ZULU: 1254

START CALENDAR DATE: 20 MAY 2021

STOP JDAY: 140

STOP TIME ZULU: 2047

STOP CALENDAR DATE: 20 MAY 2021



2. CONDITION: GPS SATELLITE SVN44 (PRN28) WAS UNUSABLE ON JDAY 140

(20 MAY 2021) BEGINNING 1254 ZULU UNTIL JDAY 140 (20 MAY 2021)

ENDING 2047 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


18 May 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021028
SUBJ: SVN47 (PRN22) FORECAST OUTAGE JDAY 148/0045 - JDAY 148/1245
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021028
NANU DTG: 182006Z MAY 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 47
PRN: 22
START JDAY: 148
START TIME ZULU: 0045
START CALENDAR DATE: 28 MAY 2021
STOP JDAY: 148
STOP TIME ZULU: 1245
STOP CALENDAR DATE: 28 MAY 2021

2. CONDITION: GPS SATELLITE SVN47 (PRN22) WILL BE UNUSABLE ON JDAY 148
(28 MAY 2021) BEGINNING 0045 ZULU UNTIL JDAY 148 (28 MAY 2021)
ENDING 1245 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


13 May 2021   

The GPS Warfighter Collaboration Cell (GWCC) is returning to our operational phone numbers. For your reference, see the contact information below: 

COMM: 719-567-2541

DSN:     560-2541

IST:       80-560-4810

 

The NIPR and SIPR websites and email addresses remain active and unchanged:

 

NIPR EMAIL: GPSOperationsCenter@us.af.mil

SIPR EMAIL: usaf.schriever.50sw-nog.mbx.gpsoc@mail.smil.mil

NIPR WEBSITE: https://gps.afspc.af.mil/gpsoc/default.aspx

SIPR WEBSITE: https://gpsoc.afspc.af.smil.mil



12 May 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021027
SUBJ: SVN44 (PRN28) FORECAST OUTAGE JDAY 140/1233 - JDAY 141/0033
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021027
NANU DTG: 121907Z MAY 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 44
PRN: 28
START JDAY: 140
START TIME ZULU: 1233
START CALENDAR DATE: 20 MAY 2021
STOP JDAY: 141
STOP TIME ZULU: 0033
STOP CALENDAR DATE: 21 MAY 2021

2. CONDITION: GPS SATELLITE SVN44 (PRN28) WILL BE UNUSABLE ON JDAY 140
(20 MAY 2021) BEGINNING 1233 ZULU UNTIL JDAY 141 (21 MAY 2021)
ENDING 0033 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


10 May 2021   

From 05 May –  13 May 2021, the GPS WarfighterCollaboration Cell (GWCC) will be utilizing the following alternate phonenumbers:

 

COMM: 805-605-2679

805-605-2701

 

DSN:      275-2679

275-2701

 

IST:        80-276-3815

80-276-3816

 

The NIPR and SIPR websites and email addresses remain activeand unchanged:

 

NIPR EMAIL: GPSOperationsCenter@us.af.mil

SIPR EMAIL: usaf.schriever.50sw-nog.mbx.gpsoc@mail.smil.mil

NIPR WEBSITE: https://gps.afspc.af.mil/gpsoc/default.aspx

SIPR WEBSITE: https://gpsoc.afspc.af.smil.mil




06 May 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021026

SUBJ: SVN71 (PRN26) FORECAST OUTAGE SUMMARY JDAY 126/0253 - JDAY 126/0834

1. NANU TYPE: FCSTSUMM

NANU NUMBER: 2021026

NANU DTG: 060842Z MAY 2021

REFERENCE NANU: 2021024

REF NANU DTG: 301453Z APR 2021

SVN: 71

PRN: 26

START JDAY: 126

START TIME ZULU: 0253

START CALENDAR DATE: 06 MAY 2021

STOP JDAY: 126

STOP TIME ZULU: 0834

STOP CALENDAR DATE: 06 MAY 2021



2. CONDITION: GPS SATELLITE SVN71 (PRN26) WAS UNUSABLE ON JDAY 126

(06 MAY 2021) BEGINNING 0253 ZULU UNTIL JDAY 126 (06 MAY 2021)

ENDING 0834 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


04 May 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021025
SUBJ: SVN57 (PRN29) UNUSABLE JDAY 097/0009 - JDAY 097/0014
1. NANU TYPE: UNUNOREF
NANU NUMBER: 2021025
NANU DTG: 041745Z MAY 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 57
PRN: 29
START JDAY: 097
START TIME ZULU: 0009
START CALENDAR DATE: 07 APR 2021
STOP JDAY: 097
STOP TIME ZULU: 0014
STOP CALENDAR DATE: 07 APR 2021

2. CONDITION: GPS SATELLITE SVN57 (PRN29) WAS UNUSABLE ON JDAY 097
(07 APR 2021) BEGINNING 0009 ZULU UNTIL JDAY 097 (07 APR 2021)
ENDING 0014 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


30 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021024

SUBJ: SVN71 (PRN26) FORECAST OUTAGE JDAY 126/0240 - JDAY 126/1440

1. NANU TYPE: FCSTDV

NANU NUMBER: 2021024

NANU DTG: 301453Z APR 2021

REFERENCE NANU: N/A

REF NANU DTG: N/A

SVN: 71

PRN: 26

START JDAY: 126

START TIME ZULU: 0240

START CALENDAR DATE: 06 MAY 2021

STOP JDAY: 126

STOP TIME ZULU: 1440

STOP CALENDAR DATE: 06 MAY 2021



2. CONDITION: GPS SATELLITE SVN71 (PRN26) WILL BE UNUSABLE ON JDAY 126

(06 MAY 2021) BEGINNING 0240 ZULU UNTIL JDAY 126 (06 MAY 2021)

ENDING 1440 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


22 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021023

SUBJ: SVN48 (PRN07) FORECAST OUTAGE SUMMARY JDAY 112/1217 - JDAY 112/2005

1. NANU TYPE: FCSTSUMM

NANU NUMBER: 2021023

NANU DTG: 222019Z APR 2021

REFERENCE NANU: 2021021

REF NANU DTG: 161525Z APR 2021

SVN: 48

PRN: 07

START JDAY: 112

START TIME ZULU: 1217

START CALENDAR DATE: 22 APR 2021

STOP JDAY: 112

STOP TIME ZULU: 2005

STOP CALENDAR DATE: 22 APR 2021



2. CONDITION: GPS SATELLITE SVN48 (PRN07) WAS UNUSABLE ON JDAY 112

(22 APR 2021) BEGINNING 1217 ZULU UNTIL JDAY 112 (22 APR 2021)

ENDING 2005 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


22 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021022
SUBJ: SVN65 (PRN24) FORECAST OUTAGE SUMMARY JDAY 102/1613 - JDAY 112/1535
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021022
NANU DTG: 221534Z APR 2021
REFERENCE NANU: 2021019
REF NANU DTG: 061632Z APR 2021
SVN: 65
PRN: 24
START JDAY: 102
START TIME ZULU: 1613
START CALENDAR DATE: 12 APR 2021
STOP JDAY: 112
STOP TIME ZULU: 1535
STOP CALENDAR DATE: 22 APR 2021

2. CONDITION: GPS SATELLITE SVN65 (PRN24) WAS UNUSABLE ON JDAY 102
(12 APR 2021) BEGINNING 1613 ZULU UNTIL JDAY 112 (22 APR 2021)
ENDING 1535 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


16 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021021
SUBJ: SVN48 (PRN07) FORECAST OUTAGE JDAY 112/1130 - JDAY 112/2330
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021021
NANU DTG: 161525Z APR 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 48
PRN: 07
START JDAY: 112
START TIME ZULU: 1130
START CALENDAR DATE: 22 APR 2021
STOP JDAY: 112
STOP TIME ZULU: 2330
STOP CALENDAR DATE: 22 APR 2021

2. CONDITION: GPS SATELLITE SVN48 (PRN07) WILL BE UNUSABLE ON JDAY 112
(22 APR 2021) BEGINNING 1130 ZULU UNTIL JDAY 112 (22 APR 2021)
ENDING 2330 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


08 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021020
SUBJ: SVN44 (PRN28) FORECAST OUTAGE SUMMARY JDAY 098/1701 - JDAY 098/2300
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021020
NANU DTG: 082303Z APR 2021
REFERENCE NANU: 2021017
REF NANU DTG: 311946Z MAR 2021
SVN: 44
PRN: 28
START JDAY: 098
START TIME ZULU: 1701
START CALENDAR DATE: 08 APR 2021
STOP JDAY: 098
STOP TIME ZULU: 2300
STOP CALENDAR DATE: 08 APR 2021

2. CONDITION: GPS SATELLITE SVN44 (PRN28) WAS UNUSABLE ON JDAY 098
(08 APR 2021) BEGINNING 1701 ZULU UNTIL JDAY 098 (08 APR 2021)
ENDING 2300 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


06 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021019
SUBJ: SVN65 (PRN24) FORECAST OUTAGE JDAY 102/1545 - JDAY 116/1545
1. NANU TYPE: FCSTMX
NANU NUMBER: 2021019
NANU DTG: 061632Z APR 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 65
PRN: 24
START JDAY: 102
START TIME ZULU: 1545
START CALENDAR DATE: 12 APR 2021
STOP JDAY: 116
STOP TIME ZULU: 1545
STOP CALENDAR DATE: 26 APR 2021

2. CONDITION: GPS SATELLITE SVN65 (PRN24) WILL BE UNUSABLE ON JDAY 102
(12 APR 2021) BEGINNING 1545 ZULU UNTIL JDAY 116 (26 APR 2021)
ENDING 1545 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


01 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021018
SUBJ: SVN68 (PRN09) FORECAST OUTAGE SUMMARY JDAY 091/1143 - JDAY 091/1745
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021018
NANU DTG: 011746Z APR 2021
REFERENCE NANU: 2021016
REF NANU DTG: 262113Z MAR 2021
SVN: 68
PRN: 09
START JDAY: 091
START TIME ZULU: 1143
START CALENDAR DATE: 01 APR 2021
STOP JDAY: 091
STOP TIME ZULU: 1745
STOP CALENDAR DATE: 01 APR 2021

2. CONDITION: GPS SATELLITE SVN68 (PRN09) WAS UNUSABLE ON JDAY 091
(01 APR 2021) BEGINNING 1143 ZULU UNTIL JDAY 091 (01 APR 2021)
ENDING 1745 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


01 Apr 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021017
SUBJ: SVN44 (PRN28) FORECAST OUTAGE JDAY 098/1645 - JDAY 099/0445
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021017
NANU DTG: 311946Z MAR 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 44
PRN: 28
START JDAY: 098
START TIME ZULU: 1645
START CALENDAR DATE: 08 APR 2021
STOP JDAY: 099
STOP TIME ZULU: 0445
STOP CALENDAR DATE: 09 APR 2021

2. CONDITION: GPS SATELLITE SVN44 (PRN28) WILL BE UNUSABLE ON JDAY 098
(08 APR 2021) BEGINNING 1645 ZULU UNTIL JDAY 099 (09 APR 2021)
ENDING 0445 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


26 Mar 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021016
SUBJ: SVN68 (PRN09) FORECAST OUTAGE JDAY 091/1135 - JDAY 092/0035
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021016
NANU DTG: 262113Z MAR 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 68
PRN: 09
START JDAY: 091
START TIME ZULU: 1135
START CALENDAR DATE: 01 APR 2021
STOP JDAY: 092
STOP TIME ZULU: 0035
STOP CALENDAR DATE: 02 APR 2021

2. CONDITION: GPS SATELLITE SVN68 (PRN09) WILL BE UNUSABLE ON JDAY 091
(01 APR 2021) BEGINNING 1135 ZULU UNTIL JDAY 092 (02 APR 2021)
ENDING 0035 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


18 Mar 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021015
SUBJ: SVN65 (PRN24) FORECAST OUTAGE SUMMARY JDAY 077/1834 - JDAY 078/0150
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021015
NANU DTG: 190150Z MAR 2021
REFERENCE NANU: 2021013
REF NANU DTG: 120541Z MAR 2021
SVN: 65
PRN: 24
START JDAY: 077
START TIME ZULU: 1834
START CALENDAR DATE: 18 MAR 2021
STOP JDAY: 078
STOP TIME ZULU: 0150
STOP CALENDAR DATE: 19 MAR 2021

2. CONDITION: GPS SATELLITE SVN65 (PRN24) WAS UNUSABLE ON JDAY 077
(18 MAR 2021) BEGINNING 1834 ZULU UNTIL JDAY 078 (19 MAR 2021)
ENDING 0150 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


12 Mar 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021014
SUBJ: SVN51 (PRN20) FORECAST OUTAGE SUMMARY JDAY 071/0454 - JDAY 071/1125
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021014
NANU DTG: 121113Z MAR 2021
REFERENCE NANU: 2021012
REF NANU DTG: 081600Z MAR 2021
SVN: 51
PRN: 20
START JDAY: 071
START TIME ZULU: 0454
START CALENDAR DATE: 12 MAR 2021
STOP JDAY: 071
STOP TIME ZULU: 1125
STOP CALENDAR DATE: 12 MAR 2021

2. CONDITION: GPS SATELLITE SVN51 (PRN20) WAS UNUSABLE ON JDAY 071
(12 MAR 2021) BEGINNING 0454 ZULU UNTIL JDAY 071 (12 MAR 2021)
ENDING 1125 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


12 Mar 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021013
SUBJ: SVN65 (PRN24) FORECAST OUTAGE JDAY 077/1815 - JDAY 078/0615
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021013
NANU DTG: 120541Z MAR 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 65
PRN: 24
START JDAY: 077
START TIME ZULU: 1815
START CALENDAR DATE: 18 MAR 2021
STOP JDAY: 078
STOP TIME ZULU: 0615
STOP CALENDAR DATE: 19 MAR 2021

2. CONDITION: GPS SATELLITE SVN65 (PRN24) WILL BE UNUSABLE ON JDAY 077
(18 MAR 2021) BEGINNING 1815 ZULU UNTIL JDAY 078 (19 MAR 2021)
ENDING 0615 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


08 Mar 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021012
SUBJ: SVN51 (PRN20) FORECAST OUTAGE JDAY 071/0415 - JDAY 071/1615
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021012
NANU DTG: 081600Z MAR 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 51
PRN: 20
START JDAY: 071
START TIME ZULU: 0415
START CALENDAR DATE: 12 MAR 2021
STOP JDAY: 071
STOP TIME ZULU: 1615
STOP CALENDAR DATE: 12 MAR 2021

2. CONDITION: GPS SATELLITE SVN51 (PRN20) WILL BE UNUSABLE ON JDAY 071
(12 MAR 2021) BEGINNING 0415 ZULU UNTIL JDAY 071 (12 MAR 2021)
ENDING 1615 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


02 Mar 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021011
SUBJ: SVN74 (PRN04) FORECAST OUTAGE SUMMARY JDAY 061/1217 - JDAY 061/1737
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021011
NANU DTG: 021736Z MAR 2021
REFERENCE NANU: 2021008
REF NANU DTG: 250141Z FEB 2021
SVN: 74
PRN: 04
START JDAY: 061
START TIME ZULU: 1217
START CALENDAR DATE: 02 MAR 2021
STOP JDAY: 061
STOP TIME ZULU: 1737
STOP CALENDAR DATE: 02 MAR 2021

2. CONDITION: GPS SATELLITE SVN74 (PRN04) WAS UNUSABLE ON JDAY 061
(02 MAR 2021) BEGINNING 1217 ZULU UNTIL JDAY 061 (02 MAR 2021)
ENDING 1737 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


26 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021010
SUBJ: SVN75 (PRN18) FORECAST OUTAGE SUMMARY JDAY 057/1736 - JDAY 057/1917
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021010
NANU DTG: 261922Z FEB 2021
REFERENCE NANU: 2021009
REF NANU DTG: 260010Z FEB 2021
SVN: 75
PRN: 18
START JDAY: 057
START TIME ZULU: 1736
START CALENDAR DATE: 26 FEB 2021
STOP JDAY: 057
STOP TIME ZULU: 1917
STOP CALENDAR DATE: 26 FEB 2021

2. CONDITION: GPS SATELLITE SVN75 (PRN18) WAS UNUSABLE ON JDAY 057
(26 FEB 2021) BEGINNING 1736 ZULU UNTIL JDAY 057 (26 FEB 2021)
ENDING 1917 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


25 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021009
SUBJ: SVN75 (PRN18) FORECAST OUTAGE JDAY 057/1600 - JDAY 058/0400
1. NANU TYPE: FCSTMX
NANU NUMBER: 2021009
NANU DTG: 260010Z FEB 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 75
PRN: 18
START JDAY: 057
START TIME ZULU: 1600
START CALENDAR DATE: 26 FEB 2021
STOP JDAY: 058
STOP TIME ZULU: 0400
STOP CALENDAR DATE: 27 FEB 2021

2. CONDITION: GPS SATELLITE SVN75 (PRN18) WILL BE UNUSABLE ON JDAY 057
(26 FEB 2021) BEGINNING 1600 ZULU UNTIL JDAY 058 (27 FEB 2021)
ENDING 0400 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


24 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021008
SUBJ: SVN74 (PRN04) FORECAST OUTAGE RESCHEDULED
1. NANU TYPE: FCSTRESCD
NANU NUMBER: 2021008
NANU DTG: 250141Z FEB 2021
REFERENCE NANU: 2021006
REF NANU DTG: 161935Z FEB 2021
SVN: 74
PRN: 04
START JDAY: 061
START TIME ZULU: 1200
START CALENDAR DATE: 02 MAR 2021
STOP JDAY: 062
STOP TIME ZULU: 0000
STOP CALENDAR DATE: 03 MAR 2021

2. CONDITION: GPS SATELLITE SVN74 (PRN04) WILL BE UNUSABLE ON JDAY 061
(02 MAR 2021) BEGINNING 1200 ZULU UNTIL JDAY 062 (03 MAR 2021)
ENDING 0000 ZULU. PLEASE REFERENCE NANU NUMBER 2021006
DTG 161935Z FEB 2021 FOR THE ORIGINAL OUTAGE TIME.

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


18 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021007
SUBJ: SVN58 (PRN12) FORECAST OUTAGE SUMMARY JDAY 049/2136 - JDAY 050/0316
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021007
NANU DTG: 190313Z FEB 2021
REFERENCE NANU: 2021005
REF NANU DTG: 111837Z FEB 2021
SVN: 58
PRN: 12
START JDAY: 049
START TIME ZULU: 2136
START CALENDAR DATE: 18 FEB 2021
STOP JDAY: 050
STOP TIME ZULU: 0316
STOP CALENDAR DATE: 19 FEB 2021

2. CONDITION: GPS SATELLITE SVN58 (PRN12) WAS UNUSABLE ON JDAY 049
(18 FEB 2021) BEGINNING 2136 ZULU UNTIL JDAY 050 (19 FEB 2021)
ENDING 0316 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


16 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021006
SUBJ: SVN74 (PRN04) FORECAST OUTAGE JDAY 056/1200 - JDAY 057/0000
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021006
NANU DTG: 161935Z FEB 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 74
PRN: 04
START JDAY: 056
START TIME ZULU: 1200
START CALENDAR DATE: 25 FEB 2021
STOP JDAY: 057
STOP TIME ZULU: 0000
STOP CALENDAR DATE: 26 FEB 2021

2. CONDITION: GPS SATELLITE SVN74 (PRN04) WILL BE UNUSABLE ON JDAY 056
(25 FEB 2021) BEGINNING 1200 ZULU UNTIL JDAY 057 (26 FEB 2021)
ENDING 0000 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


11 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021005
SUBJ: SVN58 (PRN12) FORECAST OUTAGE JDAY 049/2105 - JDAY 050/0905
1. NANU TYPE: FCSTDV
NANU NUMBER: 2021005
NANU DTG: 111837Z FEB 2021
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 58
PRN: 12
START JDAY: 049
START TIME ZULU: 2105
START CALENDAR DATE: 18 FEB 2021
STOP JDAY: 050
STOP TIME ZULU: 0905
STOP CALENDAR DATE: 19 FEB 2021

2. CONDITION: GPS SATELLITE SVN58 (PRN12) WILL BE UNUSABLE ON JDAY 049
(18 FEB 2021) BEGINNING 2105 ZULU UNTIL JDAY 050 (19 FEB 2021)
ENDING 0905 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


04 Feb 2021   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2021004
SUBJ: SVN72 (PRN08) FORECAST OUTAGE SUMMARY JDAY 035/1951 - JDAY 036/0114
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2021004
NANU DTG: 050112Z FEB 2021
REFERENCE NANU: 2021003
REF NANU DTG: 221820Z JAN 2021
SVN: 72
PRN: 08
START JDAY: 035
START TIME ZULU: 1951
START CALENDAR DATE: 04 FEB 2021
STOP JDAY: 036
STOP TIME ZULU: 0114
STOP CALENDAR DATE: 05 FEB 2021

2. CONDITION: GPS SATELLITE SVN72 (PRN08) WAS UNUSABLE ON JDAY 035
(04 FEB 2021) BEGINNING 1951 ZULU UNTIL JDAY 036 (05 FEB 2021)
ENDING 0114 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