SUBJ: GPS STATUS 22 Apr 1998
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, 13, 14, 15, 16,
   PLANE   : SLOT F1, B3, C2, D4, B4, C1, C4, A5, A1, E3, F5, E1, D2, E5,
   CLOCK   :      CS, CS, CS, CS, CS, CS, CS, RB, CS, CS, RB, CS, CS, CS,
   BLOCK II: PRNS 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31
   PLANE   : SLOT D3, F3, A4, E2, B1, E4, D1, A2, F2, A3, F4, B2, C3
   CLOCK   :      CS, CS, RB, CS, CS, CS, RB, CS, RB, 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)
1998044       061440Z APR 1998      17   FCSTMX       103/1200-104/0000
1998045       072049Z APR 1998      02   FCSTMX       110/1400-111/0200
1998047       101912Z APR 1998      17   FCSTCANC     103/1200-/
1998050       152208Z APR 1998      14   FCSTMX       117/1350-118/0150
1998052       162224Z APR 1998      13   FCSTDV       112/2030-113/1030
1998053       200030Z APR 1998      02   FCSTCANC     110/1400-/
1998054       201500Z APR 1998      13   FCSTCANC     112/2030-/
1998055       212322Z APR 1998      19   FCSTMX       118/1200-118/2300
1998056       212325Z APR 1998      19   FCSTMX       119/1200-119/2300
B. ADVISORIES:
NANU          MSG DATE/TIME     PRN    TYPE         SUMMARY (JDAY/ZULU TIME START - STOP)
1998046         101706Z APR 1998    26     UNUSUFN      100/1643-/
1998049         152026Z APR 1998    24     UNUSUFN      105/2029-/
1998051         160651Z APR 1998    24     UNUSABLE     105/2029-106/0603
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 CMDR BROOMFIELD (719)554-5770 OR DSN 692-5770.
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 1LT BRIAN BARKER, 2SOPS/DOAN
NAVIGATION ANALYST AT (719)567-6378, DSN 560-6378, OR INTERNET HTTP://WWW.FAFB.AF.MIL/GPS.