SUBJ: GPS STATUS 21 JAN 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  2, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28
   PLANE   : SLOT B3, E1, D2, E3, D3, F3, A4, B2, E2, E4, D1, A2, F2, A3, C2
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, CS, RB, CS, CS, CS
   BLOCK II: PRNS 32, 29
   PLANE   : SLOT F1, F4
   CLOCK   :      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
005-93025 121615Z JAN 93  PRN18    FCST  MAINT        025/2100 UP TO 2 HRS
B. ADVISORIES:
NANU      MSG DATE/TIME   PRN      TYPE  SUMMARY
006-93014 141459Z JAN 93  PRN13    ADV   UNUSABLE     014/0308-014/0358
007-93017 170400Z JAN 93  PRN11    ADV   UNUSABLE     017/0300-UFN
008-93017 170920Z JAN 93  PRN11    ADV   UNUSABLE     017/0300-017/0900
009-93017 171400Z JAN 93  PRN11    ADV   NANU 008-93017 MSG CORRECTION
010-93018 181620Z JAN 93  PRN11    ADV   UNUSABLE     016/1536-016/1549
011-93018 181625Z JAN 93  PRN12    ADV   UNUSABLE     016/1530-016/1545
012-93019 191507Z JAN 93  PRN3     ADV   UNUSABLE     019/0552-019/0605
013-93020 201500Z JAN 93  PRN12    ADV   UNUSABLE     020/1439-020/1440
014-93020 202245Z JAN 93  PRN13    ADV   UNUSABLE     020/2207-020/2233
015-93021 211450Z JAN 93  PRN12    ADV   UNUSABLE     021/0300-021/0309
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