NANU Types and Templates

Forecast Outages
- FCSTDV, or Forecast Delta-V, gives scheduled outage times for Delta-V maneuvers. The satellite is moved during this maintenance and the user may be required to download a new almanac.
- FCSTMX, or Forecast Maintenance, gives scheduled outage times for Ion Pump Operations or software tests.
- FCSTEXTD, or Forecast Extension, extends the scheduled outage time "Until Further Notice"; references the original NANU.
- FCSTSUMM, or Forecast Summary, gives the exact outage times for the scheduled outage, including the FCSTEXTD; sent after the maintenance is complete and the satellite is set healthy to users; references the original NANU.
- FCSTCANC, or Forecast Cancellation, cancels a scheduled outage; new maintenance time not yet determined; references the original NANU.
- FCSTRESCD, or Forecast Rescheduled, reschedules a scheduled outage; references the original NANU.
- FCSTUUFN, or Forecast Unusable Until Further Notice, scheduled outage of indefinite duration not necessarily related to Delta-V or maintenance activities.
Unscheduled Outages
- UNUSUFN, or Unusable Until Further Notice, notifies users that a satellite will be Unusable to all users until further notice.
- UNUSABLE, or UNUSABLE with a reference NANU, closes out an UNUSUFN NANU and gives the exact outage times for the outage; references the UNUSUFN NANU.
- UNUNOREF, or UNUSABLE with no reference NANU, gives times for outages that were resolved before a UNUSUFN NANU could be sent.
Other
- GENERAL, informs the user of general GPS information and is written using free flowing text.
- USABINIT, or Initially Usable, notifies users that a satellite is set healthy for the first time.
- LEAPSEC, or Leap Second, is used to notify users of an impending Leap Second and all data after the subject line is free flowing text.
- LAUNCH, is used to notify users of a recent GPS launch.
- DECOM, is used to notify users that an SV has been removed from the current constellation identified within the broadcast almanac, but does not necessarily signify permanent disposal.

FCSTDV Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) FORECAST OUTAGE JDAY JJJ/HHMM - JDAY JJJ/HHMM
1.     NANU TYPE: FCSTDV
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: JJJ
       STOP TIME ZULU: HHMM
       STOP CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WILL BE UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL JDAY JJJ (DD MMM YYYY)
    ENDING HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

FCSTMX Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) FORECAST OUTAGE JDAY JJJ/HHMM - JDAY JJJ/HHMM
1.     NANU TYPE: FCSTMX
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: JJJ
       STOP TIME ZULU: HHMM
       STOP CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WILL BE UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL JDAY JJJ (DD MMM YYYY)
    ENDING HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

FCSTEXTD Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) FORECAST OUTAGE EXTENDED UNTIL FURTHUR NOTICE
1.     NANU TYPE: FCSTEXTD
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: YYYYNNN
       REF NANU DTG: DDHHMMZ MMM YYYY
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: UFN
       STOP TIME ZULU: N/A
       STOP CALENDAR DATE: N/A

2.  CONDITION: THE FORECAST OUTAGE FOR GPS SATELLITE SVNXX (PRNXX) IS EXTENDED UNTIL FURTHER NOTICE.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

FCSTSUMM Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) FORECAST OUTAGE SUMMARY JDAY JJJ/HHMM - JDAY JJJ/HHMM
1.     NANU TYPE: FCSTSUMM
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: YYYYNNN
       REF NANU DTG: DDHHMMZ MMM YYYY
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: JJJ
       STOP TIME ZULU: HHMM
       STOP CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WAS UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL JDAY JJJ (DD MMM YYYY)
    ENDING HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

FCSTCANC Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) FORECAST OUTAGE CANCELLED
1.     NANU TYPE: FCSTCANC
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: YYYYNNN
       REF NANU DTG: DDHHMMZ MMM YYYY
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: CANCELLED
       STOP TIME ZULU: N/A
       STOP CALENDAR DATE: N/A

2.  CONDITION: THE FORECAST OUTAGE FOR GPS SATELLITE SVNXX (PRNXX) SCHEDULED FOR
    JDAY JJJ (DD MMM YYYY) BEGINNING HHMM ZULU HAS BEEN CANCELLED.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

FCSTRESCD Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) FORECAST OUTAGE RESCHEDULED
1.     NANU TYPE: FCSTRESCD
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: YYYYNNN
       REF NANU DTG: DDHHMMZ MMM YYYY
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: JJJ
       STOP TIME ZULU: HHMM
       STOP CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WILL BE UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL JDAY JJJ (DD MMM YYYY)
    ENDING HHMM ZULU. PLEASE REFERENCE NANU NUMBER YYYYNNN
    DTG DDHHMMZ MMM YYYY FOR THE ORIGINAL OUTAGE TIME.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

FCSTUUFN Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXXX (PRNXX) FORECAST OUTAGE SUMMARY JDAY JJJ/HHMM - UFN
1.     NANU TYPE: FCSTUUFN
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       SVN: XXX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXXX (PRNXX) WAS UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL FURTHER NOTICE.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

UNUSUFN Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) UNUSABLE JDAY JJJ/HHMM - UNTIL FURTHER NOTICE
1.     NANU TYPE: UNUSUFN
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: UFN
       STOP TIME ZULU: N/A
       STOP CALENDAR DATE: N/A

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WILL BE UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL FURTHER NOTICE.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

UNUSABLE Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) UNUSABLE JDAY JJJ/HHMM - JDAY JJJ/HHMM
1.     NANU TYPE: UNUSABLE
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: YYYYNNN
       REF NANU DTG: DDHHMMZ MMM YYYY
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: JJJ
       STOP TIME ZULU: HHMM
       STOP CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WAS UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL JDAY JJJ (DD MMM YYYY)
    ENDING HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

UNUNOREF Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) UNUSABLE JDAY JJJ/HHMM - JDAY JJJ/HHMM
1.     NANU TYPE: UNUNOREF
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: JJJ
       STOP TIME ZULU: HHMM
       STOP CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WAS UNUSABLE ON JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU UNTIL JDAY JJJ (DD MMM YYYY)
    ENDING HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

USABINIT Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXX (PRNXX) USABLE JDAY JJJ/HHMM
1.     NANU TYPE: USABINIT
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: N/A
       REF NANU DTG: N/A
       SVN: XX
       PRN: XX
       START JDAY: JJJ
       START TIME ZULU: HHMM
       START CALENDAR DATE: DD MMM YYYY
       STOP JDAY: N/A
       STOP TIME ZULU: N/A
       STOP CALENDAR DATE: N/A

2.  CONDITION: GPS SATELLITE SVNXX (PRNXX) WAS USABLE AS OF JDAY JJJ
    (DD MMM YYYY) BEGINNING HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

LEAPSEC Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: LEAP SECOND
1.  CONDITION: THE INTERNATIONAL EARTH ROTATION SERVICE (IERS) HAS
    ANNOUNCED THE INTRODUCTION OF A LEAP SECOND TO OCCUR AT THE END OF
    MMM YYYY

2.  COORDINATED UNIVERSAL TIME (UTC) WILL SEQUENCE AS FOLLOWS:
             DD MMM YYYY  HH HOURS MM MINUTES SS SECONDS
             DD MMM YYYY  HH HOURS MM MINUTES SS SECONDS
             DD MMM YYYY  HH HOURS MM MINUTES SS SECONDS

3.  FOR GPS, AS WITH PREVIOUS LEAP SECOND UPDATES, THE UTC DATA IN SUBFRAME 4,
    PAGE 18 OF THE NAVIGATION MESSAGE WILL CHANGE IN ACCORDANCE WITH ICD-GPS-200.
    BEFORE THE LEAP SECOND
    GPS-UTC IS XX (GPS IS AHEAD OF UTC BY XX SECONDS)

    AFTER THE LEAP SECOND
    GPS-UTC WILL BE XX (GPS WILL BE AHEAD OF UTC BY XX SECONDS)

4.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

GENERAL Template

1.     NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***

*** GENERAL MESSAGE TO ALL GPS USERS ***

LAUNCH Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVN XX (PRN XX) LAUNCH JDAY JJJ
1.     NANU TYPE: LAUNCH
       NANU NUMBER: YYYYSSS
       NANU DTG: HHMMSSZ MMM YYYY
       SVN: XX
       PRN: XX
       LAUNCH JDAY: JJJ
       LAUNCH TIME ZULU: HHMM

2.  GPS SATELLITE SVN XX (PRN XX) WAS LAUNCHED ON JDAY JJJ.
    A USABINIT NANU WILL BE SENT WHEN THE SATELLITE IS SET TO ACTIVE
    SERVICE.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

DECOM Template

NOTICE ADVISORY TO NAVSTAR USERS (NANU) YYYYSSS
SUBJ: SVNXXX (PRNXX) DECOMMISSIONING JDAY JJJ/HHMM
1.     NANU TYPE: DECOM
       NANU NUMBER: YYYYSSS
       NANU DTG: DDHHMMZ MMM YYYY
       REFERENCE NANU: YYYYSSS
       REF NANU DTG: DDHHMMZ MMM YYYY
       SVN: XXX
       PRN: XX
       UNUSABLE START JDAY: JJJ
       UNUSABLE START TIME ZULU: HHMM
       UNUSABLE START CALENDAR DATE: DD MMM YYYY
       DECOMMISSIONING START JDAY: JJJ
       DECOMMISSIONING START TIME ZULU: HHMM
       DECOMMISSIONING START CALENDAR DATE: DD MMM YYYY

2.  CONDITION: GPS SATELLITE SVNXXX (PRNXX) WAS UNUSABLE AS OF JDAY JJJ (DD MMM YYYY) AND
    REMOVED FROM THE GPS CONSTELLATION ON JDAY JJJ (DD MMM YYYY) AT HHMM ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    CIVIL AVIATION - FAA National Operations Control Center
    MILITARY - GPS Support Center at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2493, GPS_SUPPORT@SCHRIEVER.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-9994.
    COMM 805-606-9994, JSPOCCOMBATOPS@VANDENBERG.AF.MIL