SUBJ: GPS STATUS 12 MAY 93
1. SATELLITES, PLANES AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : PRNS  3, 12, 13
   PLANE   : SLOT C4, A1, C1
   CLOCK   :      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
110-93130 261535Z APR 93  PRN12    FCST   MAINT       130/1600 UP TO 5 HRS
111-93131 261540Z APR 93  PRN3     FCST   MAINT       131/1600 UP TO 5 HRS
120-93140 031614Z MAY 93  PRN20    FCST   MAINT       139/1350 UP TO 12 HRS
121-93140 031634Z MAY 93  PRN29    FCST   MAINT       140/1100 UP TO 8 HRS
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN      TYPE  SUMMARY
114-93103 281655Z APR 93  PRN31    ADV   SEE NANU     103/2053-UFN
123-93127 071545Z MAY 93  PRN3     ADV   UNUSABLE     127/1444-UFN
124-93127 071636Z MAY 93  PRN3     ADV   UNUSABLE     127/1444-127/1635
125-93127 071906Z MAY 93  PRN11    ADV   UNUSABLE     124/0020-FOREVER
126-93129 092317Z MAY 93  PRN3     ADV   UNUSABLE     129/2221-129/2300
127-93130 111410Z MAY 93  PRN27    ADV   A/S ACTIVITY 130/1500-130/2300
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 THOMPSON AT (719)550-6378/80 OR DSN 560-
6378/80