SUBJ: GPS STATUS 21 Jan 98
1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : NONE
B. BLOCK II: PRNS  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 14, 15, 16, 17,
   PLANE   : SLOT F1, B3, C2, D4, B4, C1, C4, A5, A1, E3, E1, D2, E5, D3,
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, RB, CS, CS, CS, CS, CS, CS,
   BLOCK II: PRNS 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
   PLANE   : SLOT F3, A4, E2, B1, E4, D1, A2, F2, A3, C5, F4, B2, C3
   CLOCK   :      CS, RB, CS, CS, CS, RB, CS, CS, CS, CS, RB, CS, CS
2. CURRENT ADVISORIES AND FORECASTS :
A. FORECASTS:           FOR SEVEN DAYS AFTER EVENT CONCLUDES.
NANU          MSG DATE/TIME     PRN    TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)
98002         062037Z JAN 98    08     FCSTDV       014/2340-015/1140
98003         062038Z JAN 98    24     FCSTMX       021/0050-021/1250
98005         091918Z JAN 98    08     FCSTCANC     014/2340-/
98008         151555Z JAN 98    08     FCSTDV       022/0015-022/1215
98009         151809Z JAN 98    23     FCSTCANC     025/1200-/
98010         151811Z JAN 98    08     FCSTCANC     022/0015-/
98011         151812Z JAN 98    08     FCSTDV       022/0000-022/1200
98013         202353Z JAN 98    16     FCSTDV       024/0830-024/2030
98014         210355Z JAN 98    24     FCSTSUMM     021/0127-021/0342
B. ADVISORIES:
NANU          MSG DATE/TIME     PRN    TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)
98004         091110Z JAN 98    08     UNUSUFN      009/0955-/
98012         171526Z JAN 98    16     UNUNOREF     017/1438-017/1511
C. GENERAL:
NANU          MSG DATE/TIME     PRN    TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)
3. REMARKS:
A. ANTI-SPOOF WAS DEACTIVATED ON JDAY 033 (02 FEB 97) AT OOOOZ.
ANTI-SPOOF WAS REACTIVATED ON JDAY 055 (24 FEB 97) AT 0000Z.
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 LEVELS. THE POINT OF
CONTACT IS LTCOL DAVIS (719)554-2634 OR DSN 692-2634.
C. CIVILIAN:  FOR INFORMATION, CONTACT US COAST GUARD NAVCEN AT
COMMERCIAL (703)313-5900 24 HOURS DAILY, COMPUTER BBS (703)313-5910,
AND INTERNET HTTP://WWW.NAVCEN.USCG.MIL OR FTP://FTP.NAVCEN.USCG.MIL.
D. MILITARY: FOR INFORMATION, CONTACT 2LT BRIAN BARKER, 2SOPS/DOAN
NAVIGATION ANALYST AT (719)567-6378, DSN 560-6378, COMPUTER BBS
(719)567-6379, OR INTERNET HTTP://WWW.FAFB.AF.MIL/GPS.