GPS OPERATIONAL ADVISORY 120 SUBJ: GPS STATUS 30 APR 2007

1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM): A BLOCK I : NONE B BLOCK II: PRNS 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 PLANE : SLOT F6, D1, C2, D4, B4, C1, C5, A3, A1, E3, D2, B5, F3, F1 CLOCK : CS, RB, CS, RB, RB, RB, RB, CS, RB, CS, 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, D6, A5, F2, A4, B3, F5 CLOCK : RB, RB, RB, RB, RB, RB, RB, RB, CS, RB, RB, CS, RB, CS BLOCK II: PRNS 30, 31 PLANE : SLOT B2, A2 CLOCK : CS, 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)

2007047 161515Z MAR 2007 10 FCSTMX 082/0800-082/1600
2007049 230928Z MAR 2007 10 FCSTSUMM 082/0826-082/0927
2007050 231239Z MAR 2007 06 FCSTDV 086/1400-087/0400
2007052 272008Z MAR 2007 06 FCSTSUMM 086/1410-086/2008
2007053 061804Z APR 2007 18 FCSTDV 100/1330-101/0130
2007054 061814Z APR 2007 14 FCSTMX 104/1400-105/0600
2007057 102139Z APR 2007 18 FCSTSUMM 100/1704-100/2124
2007058 150300Z APR 2007 14 FCSTSUMM 104/1409-105/0258
2007061 272139Z APR 2007 14 FCSTDV 122/1700-123/0730
B ADVISORIES: NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU TIME START - STOP)

2007055 061944Z APR 2007 23 UNUSUFN 096/1942-/
2007056 062046Z APR 2007 23 UNUSABLE 096/1942-096/2044
2007059 221026Z APR 2007 25 UNUSUFN 112/1010-/
2007060 252246Z APR 2007 25 UNUSABLE 112/1010-115/2240
C GENERAL: NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU TIME START - STOP)

2006155 062348Z DEC 2006 GENERAL /-/
2007007 101714Z JAN 2007 GENERAL /-/
2007034 052229Z MAR 2007 GENERAL /-/
2007035 060004Z MAR 2007 GENERAL /-/
2007044 141256Z MAR 2007 GENERAL /-/
2007051 231524Z MAR 2007 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 HTTP://GPS AFSPC AF MIL/GPS OR HTTP://GPS AFSPC AF MIL/GPSOC

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