SUBJ: GPS STATUS 18 AUG 92
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  2, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 28
   PLANE   : SLOT B3, E1, D2, E3, D3, F3, A4, B2, E2, E4, D1, A2, F2, C2
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, RB, 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
182-92238 041345Z AUG 92  PRN11  FCST  MAINT    231/2100- UP TO 7 DAYS
186-92230 101357Z AUG 92  PRN3   FCST  DELTA-V  230/1900- UP TO 8 HRS
191-92227 141458Z AUG 92  PRN3   FCST  CANCELLATION OF MAINT
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN     TYPE  SUMMARY
187-92224 102005Z AUG 92  SEE MSG ADV   AS TESTING  221/0100-223/1000
189-92225 121650Z AUG 92  PRN12   ADV   UNUSABLE    225/1600-225/1620
190-92227 141028Z AUG 92  PRN11   ADV   UNUSABLE    227/0945-227/1015
192-92227 141530Z AUG 92  PRN13   ADV   UNUSABLE    226/2334-227/0000
193-92228 171355Z AUG 92  PRN12   ADV   UNUSABLE    228/2017-228/2018
194-92230 171400Z AUG 92  PRN13   ADV   UNUSABLE    230/0813-230/0825
195-92231 181438Z AUG 92  PRN13   ADV   UNUSABLE    231/0745-231/0800
C. FOLLOW-UP TO FORECASTS:
REFERENCE NANU       MSG DATE/TIME      PRN         ACTUAL OUTAGE TIMES
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)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