SUBJ: GPS STATUS 15 APR 93
1. SATELLITES, PLANES AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : PRNS  3, 11, 12, 13
   PLANE   : SLOT C4, C3, A1, C1
   CLOCK   :      RB, RB, RB, CS
B. BLOCK II: PRNS  1,  2, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27
   PLANE   : SLOT F1, B3, E1, D2, E3, D3, F3, A4, B2, E2, E4, D1, A2, F2, A3
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, RB, CS, CS
   BLOCK II: PRNS 28, 29, 22, 31
   PLANE   : SLOT C2, F4, B1, C3
   CLOCK   :      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
080-93103 301720Z MAR 93  PRN20    FCST   MAINT       103/0200 UP TO 8 HRS
085-93109 071925Z APR 93  PRN2     FCST   MAINT       109/0350 UP TO 12 HRS
086-93112 071927Z APR 93  PRN1     FCST   MAINT       112/0930 UP TO 8 HRS
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN      TYPE  SUMMARY
087-93099 091322Z APR 93  PRN11    ADV   UNUSABLE     099/0945-099/1006
088-93099 091328Z APR 93  PRN12    ADV   UNUSABLE     098/2204-098/2230
089-93099 092225Z APR 93  PRN13    ADV   UNUSABLE     099/2200-099/2210
090-93103 131232Z APR 93  PRN20    ADV   UNUSABLE     103/0847- UNTIL NOTICE
091-93103 131828Z APR 93  PRN20    ADV   USABLE       103/1801
092-93103 132101Z APR 93  PRN31    ADV   USABLE       103/2053
093-93104 141839Z APR 93  PRN11    ADV   UNUSABLE     104/1758-104/1823
094-93104 150002Z APR 93  PRN31    ADV   SEE NANU     103/2053-UFN
095-93105 150559Z APR 93  PRN11    ADV   UNUSABLE     105/0500-105/0530
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. 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 Lt Col ROB WORLEY (719)554-2634 OR DSN
692-2634.
4. POINTS OF CONTACT:
A. CIVILIAN: US COAST GUARD AT COMMERCIAL (703)313-5900 VOICE OR
(703)313-5910 COMPUTER BBS.
B. MILITARY: 2SOPS/DOAI CAPTAIN HUTSELL AT (719)550-6378/80 OR DSN 560-
6378/80