GPS OPERATIONAL ADVISORY 020
SUBJ: GPS STATUS 20 JAN 2009

1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : NONE
B. BLOCK II: PRNS 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
PLANE : SLOT D1, C2, D4, B5, C5, A6, A3, A1, E3, D2, B4, F3, F1, F2
CLOCK : RB, CS, RB, RB, RB, RB, CS, CS, CS, RB, RB, RB, RB, RB
BLOCK II: PRNS 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
PLANE : SLOT B1, C4, E4, C3, E1, D3, E2, F4, D5, A5, F5, A4, B3, C1
CLOCK : RB, RB, RB, RB, RB, RB, RB, RB, CS, RB, RB, CS, RB, RB
BLOCK II: PRNS 30, 31, 32
PLANE : SLOT B2, A2, E5
CLOCK : CS, 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)

2008139 141914Z NOV 2008 27 FCSTDV 325/1200-326/1400
2008140 201901Z NOV 2008 27 FCSTSUMM 325/1204-325/1858
2008142 042011Z DEC 2008 13 FCSTDV 346/1600-347/0630
2008143 112251Z DEC 2008 13 FCSTSUMM 346/1617-346/2232
2008144 122055Z DEC 2008 14 FCSTDV 354/0230-354/1700
2008145 122106Z DEC 2008 05 FCSTMX 352/1900-353/0700
2008146 172136Z DEC 2008 05 FCSTSUMM 352/1917-352/2121
2008147 190913Z DEC 2008 14 FCSTSUMM 354/0237-354/0905
2008148 261016Z DEC 2008 15 FCSTDV 008/1930-009/1000
2009002 090223Z JAN 2009 15 FCSTSUMM 008/1938-009/0221
B. ADVISORIES:
NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU
TIME START - STOP)

2008137 140546Z NOV 2008 27 UNUSUFN 319/0448-/
2008138 141203Z NOV 2008 27 UNUSABLE 319/0448-319/1155
C. GENERAL:
NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU
TIME START - STOP)

2008141 011740Z DEC 2008 LEAPSEC /-/
2009001 062057Z JAN 2009 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
HTTP://WWW.NAVCEN.USCG.GOV
C. MILITARY SUPPORT WEBPAGES CAN BE FOUND AT THE FOLLOWING
HTTPS://GPS.AFSPC.AF.MIL/GPS OR HTTP://GPS.AFSPC.AF.MIL/GPSOC