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25 Jun 2022
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25 Jun 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022031

SUBJ: SVN72 (PRN08) FORECAST OUTAGE JDAY 181/0730 - JDAY 181/1930

1. NANU TYPE: FCSTDV

NANU NUMBER: 2022031

NANU DTG: 251519Z JUN 2022

REFERENCE NANU: N/A

REF NANU DTG: N/A

SVN: 72

PRN: 08

START JDAY: 181

START TIME ZULU: 0730

START CALENDAR DATE: 30 JUN 2022

STOP JDAY: 181

STOP TIME ZULU: 1930

STOP CALENDAR DATE: 30 JUN 2022



2. CONDITION: GPS SATELLITE SVN72 (PRN08) WILL BE UNUSABLE ON JDAY 181

(30 JUN 2022) BEGINNING 0730 ZULU UNTIL JDAY 181 (30 JUN 2022)

ENDING 1930 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 Jun 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022030
SUBJ: SVN68 (PRN09) FORECAST OUTAGE SUMMARY JDAY 175/0815 - JDAY 175/1335
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022030
NANU DTG: 241407Z JUN 2022
REFERENCE NANU: 2022029
REF NANU DTG: 211417Z JUN 2022
SVN: 68
PRN: 09
START JDAY: 175
START TIME ZULU: 0815
START CALENDAR DATE: 24 JUN 2022
STOP JDAY: 175
STOP TIME ZULU: 1335
STOP CALENDAR DATE: 24 JUN 2022

2. CONDITION: GPS SATELLITE SVN68 (PRN09) WAS UNUSABLE ON JDAY 175
(24 JUN 2022) BEGINNING 0815 ZULU UNTIL JDAY 175 (24 JUN 2022)
ENDING 1335 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


21 Jun 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022029
SUBJ: SVN68 (PRN09) FORECAST OUTAGE JDAY 175/0745 - JDAY 175/1945
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022029
NANU DTG: 211417Z JUN 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 68
PRN: 09
START JDAY: 175
START TIME ZULU: 0745
START CALENDAR DATE: 24 JUN 2022
STOP JDAY: 175
STOP TIME ZULU: 1945
STOP CALENDAR DATE: 24 JUN 2022

2. CONDITION: GPS SATELLITE SVN68 (PRN09) WILL BE UNUSABLE ON JDAY 175
(24 JUN 2022) BEGINNING 0745 ZULU UNTIL JDAY 175 (24 JUN 2022)
ENDING 1945 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 Jun 2022    Urgent

ALCON,

 

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

 

COMM:  719-567-2541

               719-567-5180

 

DSN:        567-2541

                 567-5180

 

IST:         80-560-4810

               80-560-4811

 

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

 

NIPR E-Mail: GPSOperationsCenter@us.af.mil

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

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

SIPR Website: http://gpsoc.af.smil.mil



10 Jun 2022    Urgent

From 10 – 17 June 2022, the GPS Warfighter CollaborationCell (GWCC) will be utilizing the following alternate phone numbers:

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 remainactive and unchanged:

 

NIPR E-Mail: GPSOperationsCenter@us.af.mil 

 

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

 

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

 

SIPR Website: http://gpsoc.af.smil.mil



07 Jun 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022028
SUBJ: SVN55 (PRN15) FORECAST OUTAGE SUMMARY JDAY 158/1317 - JDAY 158/2044
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022028
NANU DTG: 072119Z JUN 2022
REFERENCE NANU: 2022027
REF NANU DTG: 012111Z JUN 2022
SVN: 55
PRN: 15
START JDAY: 158
START TIME ZULU: 1317
START CALENDAR DATE: 07 JUN 2022
STOP JDAY: 158
STOP TIME ZULU: 2044
STOP CALENDAR DATE: 07 JUN 2022

2. CONDITION: GPS SATELLITE SVN55 (PRN15) WAS UNUSABLE ON JDAY 158
(07 JUN 2022) BEGINNING 1317 ZULU UNTIL JDAY 158 (07 JUN 2022)
ENDING 2044 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 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022027
SUBJ: SVN55 (PRN15) FORECAST OUTAGE JDAY 158/1215 - JDAY 159/0015
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022027
NANU DTG: 012111Z JUN 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 55
PRN: 15
START JDAY: 158
START TIME ZULU: 1215
START CALENDAR DATE: 07 JUN 2022
STOP JDAY: 159
STOP TIME ZULU: 0015
STOP CALENDAR DATE: 08 JUN 2022

2. CONDITION: GPS SATELLITE SVN55 (PRN15) WILL BE UNUSABLE ON JDAY 158
(07 JUN 2022) BEGINNING 1215 ZULU UNTIL JDAY 159 (08 JUN 2022)
ENDING 0015 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 May 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022026
SUBJ: SVN58 (PRN12) FORECAST OUTAGE SUMMARY JDAY 146/1726 - JDAY 147/0007
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022026
NANU DTG: 270025Z MAY 2022
REFERENCE NANU: 2022024
REF NANU DTG: 231423Z MAY 2022
SVN: 58
PRN: 12
START JDAY: 146
START TIME ZULU: 1726
START CALENDAR DATE: 26 MAY 2022
STOP JDAY: 147
STOP TIME ZULU: 0007
STOP CALENDAR DATE: 27 MAY 2022

2. CONDITION: GPS SATELLITE SVN58 (PRN12) WAS UNUSABLE ON JDAY 146
(26 MAY 2022) BEGINNING 1726 ZULU UNTIL JDAY 147 (27 MAY 2022)
ENDING 0007 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 May 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022025
SUBJ: SVN78 (PRN11) USABLE JDAY 145/1712
1. NANU TYPE: USABINIT
NANU NUMBER: 2022025
NANU DTG: 251712Z MAY 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 78
PRN: 11
START JDAY: 145
START TIME ZULU: 1712
START CALENDAR DATE: 25 MAY 2022
STOP JDAY: N/A
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN78 (PRN11) WAS USABLE AS OF JDAY 145
(25 MAY 2022) BEGINNING 1712 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 May 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022024
SUBJ: SVN58 (PRN12) FORECAST OUTAGE JDAY 146/1715 - JDAY 147/0515
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022024
NANU DTG: 231423Z MAY 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 58
PRN: 12
START JDAY: 146
START TIME ZULU: 1715
START CALENDAR DATE: 26 MAY 2022
STOP JDAY: 147
STOP TIME ZULU: 0515
STOP CALENDAR DATE: 27 MAY 2022

2. CONDITION: GPS SATELLITE SVN58 (PRN12) WILL BE UNUSABLE ON JDAY 146
(26 MAY 2022) BEGINNING 1715 ZULU UNTIL JDAY 147 (27 MAY 2022)
ENDING 0515 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 May 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022023
SUBJ: SVN75 (PRN18) FORECAST OUTAGE SUMMARY JDAY 139/2019 - JDAY 140/0203
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022023
NANU DTG: 200206Z MAY 2022
REFERENCE NANU: 2022022
REF NANU DTG: 121459Z MAY 2022
SVN: 75
PRN: 18
START JDAY: 139
START TIME ZULU: 2019
START CALENDAR DATE: 19 MAY 2022
STOP JDAY: 140
STOP TIME ZULU: 0203
STOP CALENDAR DATE: 20 MAY 2022

2. CONDITION: GPS SATELLITE SVN75 (PRN18) WAS UNUSABLE ON JDAY 139
(19 MAY 2022) BEGINNING 2019 ZULU UNTIL JDAY 140 (20 MAY 2022)
ENDING 0203 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 May 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022022
SUBJ: SVN75 (PRN18) FORECAST OUTAGE JDAY 139/2015 - JDAY 140/0815
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022022
NANU DTG: 121459Z MAY 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 75
PRN: 18
START JDAY: 139
START TIME ZULU: 2015
START CALENDAR DATE: 19 MAY 2022
STOP JDAY: 140
STOP TIME ZULU: 0815
STOP CALENDAR DATE: 20 MAY 2022

2. CONDITION: GPS SATELLITE SVN75 (PRN18) WILL BE UNUSABLE ON JDAY 139
(19 MAY 2022) BEGINNING 2015 ZULU UNTIL JDAY 140 (20 MAY 2022)
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


21 Apr 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022021
SUBJ: SVN53 (PRN17) FORECAST OUTAGE SUMMARY JDAY 111/1613 - JDAY 111/2114
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022021
NANU DTG: 212115Z APR 2022
REFERENCE NANU: 2022020
REF NANU DTG: 180245Z APR 2022
SVN: 53
PRN: 17
START JDAY: 111
START TIME ZULU: 1613
START CALENDAR DATE: 21 APR 2022
STOP JDAY: 111
STOP TIME ZULU: 2114
STOP CALENDAR DATE: 21 APR 2022

2. CONDITION: GPS SATELLITE SVN53 (PRN17) WAS UNUSABLE ON JDAY 111
(21 APR 2022) BEGINNING 1613 ZULU UNTIL JDAY 111 (21 APR 2022)
ENDING 2114 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 Apr 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022020
SUBJ: SVN53 (PRN17) FORECAST OUTAGE JDAY 111/1530 - JDAY 112/0330
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022020
NANU DTG: 180245Z APR 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 53
PRN: 17
START JDAY: 111
START TIME ZULU: 1530
START CALENDAR DATE: 21 APR 2022
STOP JDAY: 112
STOP TIME ZULU: 0330
STOP CALENDAR DATE: 22 APR 2022

2. CONDITION: GPS SATELLITE SVN53 (PRN17) WILL BE UNUSABLE ON JDAY 111
(21 APR 2022) BEGINNING 1530 ZULU UNTIL JDAY 112 (22 APR 2022)
ENDING 0330 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 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022019
SUBJ: SVN45 (PRN21) FORECAST OUTAGE SUMMARY JDAY 098/0315 - JDAY 098/1342
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022019
NANU DTG: 081349Z APR 2022
REFERENCE NANU: 2022018
REF NANU DTG: 041706Z APR 2022
SVN: 45
PRN: 21
START JDAY: 098
START TIME ZULU: 0315
START CALENDAR DATE: 08 APR 2022
STOP JDAY: 098
STOP TIME ZULU: 1342
STOP CALENDAR DATE: 08 APR 2022

2. CONDITION: GPS SATELLITE SVN45 (PRN21) WAS UNUSABLE ON JDAY 098
(08 APR 2022) BEGINNING 0315 ZULU UNTIL JDAY 098 (08 APR 2022)
ENDING 1342 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 Apr 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022018
SUBJ: SVN45 (PRN21) FORECAST OUTAGE JDAY 098/0315 - JDAY 098/1515
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022018
NANU DTG: 041706Z APR 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 45
PRN: 21
START JDAY: 098
START TIME ZULU: 0315
START CALENDAR DATE: 08 APR 2022
STOP JDAY: 098
STOP TIME ZULU: 1515
STOP CALENDAR DATE: 08 APR 2022

2. CONDITION: GPS SATELLITE SVN45 (PRN21) WILL BE UNUSABLE ON JDAY 098
(08 APR 2022) BEGINNING 0315 ZULU UNTIL JDAY 098 (08 APR 2022)
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


28 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022017
SUBJ: SVN77 (PRN14) UNUSABLE JDAY 087/0740 - JDAY 087/2035
1. NANU TYPE: UNUSABLE
NANU NUMBER: 2022017
NANU DTG: 282108Z MAR 2022
REFERENCE NANU: 2022014
REF NANU DTG: 280753Z MAR 2022
SVN: 77
PRN: 14
START JDAY: 087
START TIME ZULU: 0740
START CALENDAR DATE: 28 MAR 2022
STOP JDAY: 087
STOP TIME ZULU: 2035
STOP CALENDAR DATE: 28 MAR 2022

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS UNUSABLE ON JDAY 087
(28 MAR 2022) BEGINNING 0740 ZULU UNTIL JDAY 087 (28 MAR 2022)
ENDING 2035 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022016 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
PLEASE DISREGARD NANU 2022015 DUE TO AN ERROR IN THE NAMING CONVENTION. OUTAGE START AND STOP TIMES REMAIN ACCURATE. THE CORRECT NANU WILL BE LABELED UNUSABLE.
*** 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


28 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022015
SUBJ: SVN77 (PRN14) FORECAST OUTAGE SUMMARY JDAY 087/0740 - JDAY 087/2035
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022015
NANU DTG: 282035Z MAR 2022
REFERENCE NANU: 2022014
REF NANU DTG: 280753Z MAR 2022
SVN: 77
PRN: 14
START JDAY: 087
START TIME ZULU: 0740
START CALENDAR DATE: 28 MAR 2022
STOP JDAY: 087
STOP TIME ZULU: 2035
STOP CALENDAR DATE: 28 MAR 2022

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS UNUSABLE ON JDAY 087
(28 MAR 2022) BEGINNING 0740 ZULU UNTIL JDAY 087 (28 MAR 2022)
ENDING 2035 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022014
SUBJ: SVN77 (PRN14) UNUSABLE JDAY 087/0740 - UNTIL FURTHER NOTICE
1. NANU TYPE: UNUSUFN
NANU NUMBER: 2022014
NANU DTG: 280753Z MAR 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 77
PRN: 14
START JDAY: 087
START TIME ZULU: 0740
START CALENDAR DATE: 28 MAR 2022
STOP JDAY: UFN
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS UNUSABLE ON JDAY 087
(28 MAR 2022) BEGINNING 0740 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


24 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022013
SUBJ: SVN51 (PRN20) FORECAST OUTAGE SUMMARY JDAY 083/1530 - JDAY 083/2324
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022013
NANU DTG: 242332Z MAR 2022
REFERENCE NANU: 2022011
REF NANU DTG: 171538Z MAR 2022
SVN: 51
PRN: 20
START JDAY: 083
START TIME ZULU: 1530
START CALENDAR DATE: 24 MAR 2022
STOP JDAY: 083
STOP TIME ZULU: 2324
STOP CALENDAR DATE: 24 MAR 2022

2. CONDITION: GPS SATELLITE SVN51 (PRN20) WAS UNUSABLE ON JDAY 083
(24 MAR 2022) BEGINNING 1530 ZULU UNTIL JDAY 083 (24 MAR 2022)
ENDING 2324 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022012
SUBJ: SVN64 (PRN30) FORECAST OUTAGE SUMMARY JDAY 076/1434 - JDAY 076/1920
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022012
NANU DTG: 171926Z MAR 2022
REFERENCE NANU: 2022009
REF NANU DTG: 102302Z MAR 2022
SVN: 64
PRN: 30
START JDAY: 076
START TIME ZULU: 1434
START CALENDAR DATE: 17 MAR 2022
STOP JDAY: 076
STOP TIME ZULU: 1920
STOP CALENDAR DATE: 17 MAR 2022

2. CONDITION: GPS SATELLITE SVN64 (PRN30) WAS UNUSABLE ON JDAY 076
(17 MAR 2022) BEGINNING 1434 ZULU UNTIL JDAY 076 (17 MAR 2022)
ENDING 1920 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022011
SUBJ: SVN51 (PRN20) FORECAST OUTAGE JDAY 083/1530 - JDAY 084/0330
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022011
NANU DTG: 171538Z MAR 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 51
PRN: 20
START JDAY: 083
START TIME ZULU: 1530
START CALENDAR DATE: 24 MAR 2022
STOP JDAY: 084
STOP TIME ZULU: 0330
STOP CALENDAR DATE: 25 MAR 2022

2. CONDITION: GPS SATELLITE SVN51 (PRN20) WILL BE UNUSABLE ON JDAY 083
(24 MAR 2022) BEGINNING 1530 ZULU UNTIL JDAY 084 (25 MAR 2022)
ENDING 0330 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022010
SUBJ: SVN61 (PRN02) FORECAST OUTAGE SUMMARY JDAY 069/2356 - JDAY 070/0418
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022010
NANU DTG: 110430Z MAR 2022
REFERENCE NANU: 2022008
REF NANU DTG: 032027Z MAR 2022
SVN: 61
PRN: 02
START JDAY: 069
START TIME ZULU: 2356
START CALENDAR DATE: 10 MAR 2022
STOP JDAY: 070
STOP TIME ZULU: 0418
STOP CALENDAR DATE: 11 MAR 2022

2. CONDITION: GPS SATELLITE SVN61 (PRN02) WAS UNUSABLE ON JDAY 069
(10 MAR 2022) BEGINNING 2356 ZULU UNTIL JDAY 070 (11 MAR 2022)
ENDING 0418 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022009
SUBJ: SVN64 (PRN30) FORECAST OUTAGE JDAY 076/1430 - JDAY 077/0230
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022009
NANU DTG: 102302Z MAR 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 64
PRN: 30
START JDAY: 076
START TIME ZULU: 1430
START CALENDAR DATE: 17 MAR 2022
STOP JDAY: 077
STOP TIME ZULU: 0230
STOP CALENDAR DATE: 18 MAR 2022

2. CONDITION: GPS SATELLITE SVN64 (PRN30) WILL BE UNUSABLE ON JDAY 076
(17 MAR 2022) BEGINNING 1430 ZULU UNTIL JDAY 077 (18 MAR 2022)
ENDING 0230 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 Mar 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022008
SUBJ: SVN61 (PRN02) FORECAST OUTAGE JDAY 069/2345 - JDAY 070/1145
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022008
NANU DTG: 032027Z MAR 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 61
PRN: 02
START JDAY: 069
START TIME ZULU: 2345
START CALENDAR DATE: 10 MAR 2022
STOP JDAY: 070
STOP TIME ZULU: 1145
STOP CALENDAR DATE: 11 MAR 2022

2. CONDITION: GPS SATELLITE SVN61 (PRN02) WILL BE UNUSABLE ON JDAY 069
(10 MAR 2022) BEGINNING 2345 ZULU UNTIL JDAY 070 (11 MAR 2022)
ENDING 1145 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 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022007
SUBJ: SVN70 (PRN32) FORECAST OUTAGE SUMMARY JDAY 055/0946 - JDAY 055/1448
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2022007
NANU DTG: 241504Z FEB 2022
REFERENCE NANU: 2022006
REF NANU DTG: 162012Z FEB 2022
SVN: 70
PRN: 32
START JDAY: 055
START TIME ZULU: 0946
START CALENDAR DATE: 24 FEB 2022
STOP JDAY: 055
STOP TIME ZULU: 1448
STOP CALENDAR DATE: 24 FEB 2022

2. CONDITION: GPS SATELLITE SVN70 (PRN32) WAS UNUSABLE ON JDAY 055
(24 FEB 2022) BEGINNING 0946 ZULU UNTIL JDAY 055 (24 FEB 2022)
ENDING 1448 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 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022006
SUBJ: SVN70 (PRN32) FORECAST OUTAGE JDAY 055/0930 - JDAY 055/2130
1. NANU TYPE: FCSTDV
NANU NUMBER: 2022006
NANU DTG: 162012Z FEB 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 70
PRN: 32
START JDAY: 055
START TIME ZULU: 0930
START CALENDAR DATE: 24 FEB 2022
STOP JDAY: 055
STOP TIME ZULU: 2130
STOP CALENDAR DATE: 24 FEB 2022

2. CONDITION: GPS SATELLITE SVN70 (PRN32) WILL BE UNUSABLE ON JDAY 055
(24 FEB 2022) BEGINNING 0930 ZULU UNTIL JDAY 055 (24 FEB 2022)
ENDING 2130 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 Feb 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022005
SUBJ: SVN77 (PRN14) UNUSABLE JDAY 046/0039 - JDAY 046/2102
1. NANU TYPE: UNUSABLE
NANU NUMBER: 2022005
NANU DTG: 152106Z FEB 2022
REFERENCE NANU: 2022004
REF NANU DTG: 150125Z FEB 2022
SVN: 77
PRN: 14
START JDAY: 046
START TIME ZULU: 0039
START CALENDAR DATE: 15 FEB 2022
STOP JDAY: 046
STOP TIME ZULU: 2102
STOP CALENDAR DATE: 15 FEB 2022

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS UNUSABLE ON JDAY 046
(15 FEB 2022) BEGINNING 0039 ZULU UNTIL JDAY 046 (15 FEB 2022)
ENDING 2102 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


14 Feb 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022004
SUBJ: SVN77 (PRN14) UNUSABLE JDAY 046/0039 - UNTIL FURTHER NOTICE
1. NANU TYPE: UNUSUFN
NANU NUMBER: 2022004
NANU DTG: 150125Z FEB 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 77
PRN: 14
START JDAY: 046
START TIME ZULU: 0039
START CALENDAR DATE: 15 FEB 2022
STOP JDAY: UFN
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN77 (PRN14) WAS UNUSABLE ON JDAY 046
(15 FEB 2022) BEGINNING 0039 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


26 Jan 2022   
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2022003
SUBJ: SVN41 (PRN22) USABLE JDAY 026/2140
1. NANU TYPE: USABINIT
NANU NUMBER: 2022003
NANU DTG: 262232Z JAN 2022
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 41
PRN: 22
START JDAY: 026
START TIME ZULU: 2140
START CALENDAR DATE: 26 JAN 2022
STOP JDAY: N/A
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN41 (PRN22) WAS USABLE AS OF JDAY 026
(26 JAN 2022) BEGINNING 2140 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 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