SUBJ: GPS STATUS 23 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
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
104-93123 202131Z APR 93  PRN17    FCST   MAINT       123/0050 UP TO 12 HRS
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN      TYPE  SUMMARY
096-93106 160512Z APR 93  PRN18    ADV   UNUSABLE     106/0409-106/0440
097-93106 162230Z APR 93  PRN3     ADV   UNUSABLE     106/2200-106/2230
098-93109 190654Z APR 93  PRN13    ADV   USABLE       109/0633
099-93109 191354Z APR 93  PRN13    ADV   NANU 098-93109 CORRECTION
100-93109 191357Z APR 93  PRN3     ADV   UNUSABLE     108/0904-108/0910
101-93109 191359Z APR 93  PRN11    ADV   UNUSABLE     108/2137-108/2142
102-93109 191401Z APR 93  PRN12    ADV   UNUSABLE     109/0035-109/0037
103-93110 201345Z APR 93  PRN12    ADV   UNUSABLE     110/0616-110/0642
105-93112 221311Z APR 93  PRN3     ADV   UNUSABLE     112/0846-112/0905
106-93112 221921Z APR 93  PRN1     ADV   USABLE       112/1921
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