SUBJ: GPS STATUS 1 APR 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, RB, CS
B. BLOCK II: PRNS  2, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25
   PLANE   : SLOT B3, E1, D2, E3, D3, F3, A4, B2, E2, E4, D1  A2
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, CS  RB
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
049-92092 272151Z MAR 92  PRN11  FCST  UNUSABLE 092/2320 UP TO 8 HRS
052-92097 311411Z MAR 92  PRN15  FCST  UNUSABLE 097/1050 UP TO 12 HRS
053-92094 311717Z MAR 92  PRN18  FCST  UNUSABLE 094/1645-094/2000
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
047-92086 260157Z MAR 92  PRN11  ADV   UNUSABLE 086/0100-086/0130
048-92086 261552Z MAR 92  PRN13  ADV   UNUSABLE 086/0251-086/0259
050-92089 290345Z MAR 92  PRN15  ADV   UNUSABLE 089/0000-089/0600
051-92089 301352Z MAR 92  PRN3   ADV   UNUSABLE 089/1100-089/1113
054-92092 010850Z APR 92  PRN20  ADV   UNUSABLE 092/0615- UFN
055-92092 011441Z APR 92  PRN20  ADV   USABLE   092/1152
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.
C. P-CODE WAS UNAVAILABLE BEGINNING DAY 084 (24 MAR 92) AT 2300 UTC
UNTIL DAY 085 AT 0100 UTC, AGAIN ON DAY 085 AT 2300 UTC UNTIL DAY
086 AT 0100 UTC, AND AGAIN ON DAY 086 AT 2300 UNTIL DAY 087 (27
MAR 92) AT 0100 UTC. THROUGHOUT THIS TIME STANDARD POSITIONING
SERVICE WAS AVAILABLE USING C/A-CODE THROUGHOUT THESE TIMES.
4. POINTS OF CONTACT:
A. CIVILIAN: US COAST GUARD AT COMMERCIAL (703)866-3806 VOICE OR
(703)866-3890 COMPUTER BBS.
B. MILITARY: 2SOPS/DOAI 1LT SKINNER AT (719)550-6378/80 OR DSN 560-
6378/80