SUBJ: GPS STATUS 16 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
059-92101 071859Z APR 92  PRN12  FCST  UNUSABLE 101/0935 UP TO 8 HRS
067-92104 131423Z APR 92  PRN11  FCST  USABLE NET 107/0000
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN    TYPE  SUMMARY
062-92100 091342Z APR 92  PRN13  ADV   UNUSABLE 100/1200-100/1214
063-92100 091740Z APR 92  PRN15  ADV   INTRMTN LOCK 100/1430-2000
064-92101 101932Z APR 92  PRN12  ADV   UNUSABLE 101/0935-101/1930
065-92102 131314Z APR 92  PRN3   ADV   UNUSABLE 102/0113-102/0142
066-92102 131327Z APR 92  PRN6   ADV   UNUSABLE 102/1202-102/1223
068-92105 142252Z APR 92  PRN11  ADV   USABLE   105/2145
069-92106 151322Z APR 92  PRN12  ADV   UNUSABLE 106/1200-106/1214
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