SUBJ: GPS STATUS 20 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
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
135-93147 131620Z MAY 93  PRN22    FCST   MAINT       147/0930 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
128-93133 130343Z MAY 93  PRN3     ADV   UNUSABLE     133/0320-UFN
129-93133 130542Z MAY 93  PRN3     ADV   UNUSABLE     133/0320-133/0520
130-93133 131352Z MAY 93  PRN3     ADV   UNUSABLE     133/0258-133/0520
132-93133 131415Z MAY 93  PRN13    ADV   UNUSABLE     133/0117-133/0125
133-93133 131521Z MAY 93  PRN13    ADV   UNUSABLE     133/1437-133/1503
134-93133 131541Z MAY 93  PRN7     ADV   LAUNCH       133/0007
136-93135 150529Z MAY 93  PRN3     ADV   UNUSABLE     135/0445-UFN
137-93135 150714Z MAY 93  PRN3     ADV   UNUSABLE     135/0445-135/0645
138-93137 171336Z MAY 93  PRN3     ADV   UNUSABLE     135/0110-135/0111
139-93137 171347Z MAY 93  PRN3     ADV   UNUSABLE     135/0214-135/0215
140-93137 171351Z MAY 93  PRN13    ADV   UNUSABLE     136/1400-136/1415
141-93137 171420Z MAY 93  PRN3     ADV   UNUSABLE     135/0437-135/0645
142-93137 172010Z MAY 93  PRN12    ADV   UNUSABLE     137/1917-137/1943
143-93138 181113Z MAY 93  PRN3     ADV   UNUSABLE     138/1045-UFN
144-93138 181236Z MAY 93  PRN3     ADV   UNUSABLE     138/1045-138/1235
145-93138 181929Z MAY 93  PRN3     ADV   UNUSABLE     138/1030-138/1235
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