UNCLASSIFIED
GPS OPERATIONAL ADVISORY        352.OA1
SUBJ: GPS STATUS      18 DEC 2025

1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I  : NONE
B. BLOCK II : PRNS  2,  3,  5,  6,  7,  8,  9, 10, 12, 13, 15, 16, 17, 19
   PLANE    : SLOT D1, E1, E3, D4, A4, C3, F3, E2, B4, F6, F2, B1, C4, C5
   CLOCK    :      RB, RB, RB, RB, RB, RB, RB, RB, RB, RB, RB, RB, RB, RB
   BLOCK II : PRNS 20, 22, 24, 25, 26, 27, 29, 30, 31, 32
   PLANE    : SLOT E4, B3, A1, B2, B5, C2, C1, A3, A2, F1
   CLOCK    :      RB, RB, RB, RB, RB, RB, RB, RB, RB, RB
C. BLOCK III: PRNS  1,  4, 11, 14, 18, 21, 23, 28
   PLANE    : SLOT D2, F4, D5, B6, D6, E6, E5, A6
   CLOCK    :      RB, RB, RB, RB, RB, RB, RB, RB

2. CURRENT ADVISORIES AND FORECASTS :
A. FORECASTS:           FOR SEVEN DAYS AFTER EVENT CONCLUDES.
NANU          MSG DATE/TIME       PRN  TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)

2025076       040808Z DEC 2025    17   FCSTDV       338/0600-338/1800
2025078       102034Z DEC 2025    17   FCSTSUMM     338/0608-338/1220
2025080       121711Z DEC 2025    29   FCSTDV       352/2145-353/0945
2025081       121714Z DEC 2025    30   FCSTDV       350/1915-351/0715
2025083       132219Z DEC 2025    01   FCSTSUMM     347/1504-347/2218
2025087       170208Z DEC 2025    30   FCSTSUMM     350/1927-351/0149
B. ADVISORIES:           
NANU          MSG DATE/TIME       PRN  TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)

2025079       111049Z DEC 2025    27   UNUSUFN      345/1041-/
2025082       131516Z DEC 2025    01   UNUSUFN      347/1504-/
2025084       141843Z DEC 2025    01   UNUSUFN      348/1840-/
2025086       160701Z DEC 2025    01   UNUSABLE     348/1840-350/0700
2025088       172046Z DEC 2025    27   UNUSABLE     345/1041-351/2041
C. GENERAL:           
NANU          MSG DATE/TIME       PRN  TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)

2014038       241350Z APR 2014         GENERAL      /-/
2014039       271351Z APR 2014         GENERAL      /-/
2025017       202130Z FEB 2025         GENERAL      /-/
2025067       251458Z SEP 2025         GENERAL      /-/
2025075       062051Z NOV 2025         GENERAL      /-/
2025077       102031Z DEC 2025         GENERAL      /-/
2025085       151813Z DEC 2025         GENERAL      /-/

3. REMARKS:
A. THE POINT OF CONTACT FOR GPS MILITARY OPERATIONAL SUPPORT IS THE GPS 
OPERATIONS CENTER AT 719-567-2541 OR DSN 560-2541.
B. CIVILIAN:  FOR INFORMATION, CONTACT US COAST GUARD NAVCEN AT
COMMERCIAL 703-313-5900 24 HOURS DAILY AND INTERNET 
HTTPS://WWW.NAVCEN.USCG.GOV
C. MILITARY SUPPORT WEBPAGES CAN BE FOUND AT THE FOLLOWING
HTTPS://GWCC-WS.CCE.AF.MIL/GPS OR HTTPS://GWCC-WS.CCE.AF.MIL/GPSOC