SUBJ: GPS STATUS 05 FEB 92 1. SATELLITES, PLANES AND CLOCKS (CS=CESIUM RB=RUBIDIUM): A. BLOCK I : PRNS 3, 6, 11, 12, 13 PLANE : SLOT C4, A3, C3, A1, C1 CLOCK : RB, RB, CS, CS, CS B. BLOCK II: PRNS 2, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24 PLANE : SLOT B3, E1, D2, E3, D3, F3, A4, B2, E2, E4, D1 CLOCK : CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, CS 2. CURRENT ADVISORIES (ADV) AND FORECASTS (FCST): INFORMATION IS REPEATED FOR SEVEN DAYS AFTER EVENT CONCLUDES. A. FORECASTS: NANU MSG DATE/TIME PRN TYPE SUMMARY 121-91182 011354Z JUL 91 BLKII FCST SA ON 182/0400- UFN 010-92030 291939Z JAN 92 PRN11&23 FCST MAINTENANCE 013-92033 312325Z JAN 92 PRN12 FCST SCHEDULED MAINTENANCE B. ADVISORIES: NANU MSG DATE/TIME PRN TYPE SUMMARY 012-92031 311430Z JAN 92 PRN13 ADV 031/1100-031/1114 014-92033 031416Z FEB 92 PRN11 ADV 033/1000-033/1014 015-92034 031601Z FEB 92 PRN20 ADV 034/1506-UNTIL FURTHER NOTICE 016-92034 031945Z FEB 92 PRN20 ADV 034/1506-034/1847 017-92035 040307Z FEB 92 PRN6 ADV 035/0211-035/0223 018-92036 051342Z FEB 92 PRN3 ADV 036/0200-036/0214 PRN6 ADV 036/1127-036/1139 3. REMARKS: A. USERS OF GPS ARE CAUTIONED THAT THE SYSTEM IS NOT YET FULLY OPERATIONAL. SIGNAL AVAILABILITY AND ACCURACY ARE SUBJECT TO CHANGE DUE TO AN INCOMPLETE CONSTELLATION AND OPERATIONAL TEST ACTIVITIES. B. REF NANU 121 - SELECTIVE AVAILABILITY WAS REACTIVATED AT STANDARD POSITIONING SERVICE ACCURACY LEVELS ON DAY 182 (01 JUL 91) AT 0400 UTC. VARIATIONS MAY BE SEEN IN THE EFFECT OF SA DURING TESTING, BUT THE EFFECT SHOULD NOT EXCEED STANDARD POSITIONING SERVICE LEVELS. THE POINT OF CONTACT IS MAJ ROB WORLEY (719)554-2634 OR DSN 692-2634. 4. POINTS OF CONTACT: A. CIVILIAN: US COAST GUARD AT COMMERCIAL (703)866-3806 VOICE OR (703)866-3890 COMPUTER BBS. B. MILITARY: 2SCS/DOAI 1LT INGEGNERI AT (719)550-6379 OR DSN 560-6379