NOTICE ADVISORY TO NAVSTAR USERS (NANU) #018-90030
SUBJ: PRN17 UNUSABLE 31/1300-31 ORBIT POSITION ADJUSTMENT
1. CONDITION: PRN17 WILL BE UNUSABLE BEGINNING 31 JAN 90 (DAY 31)
AT 1300UTC UNTIL 31 JAN 90 (DAY 31) ENDING APPROXIMATELY 1900UTC.
2. RECOMMENDATION: CODE USERS SHOULD UPDATE ALMANAC DATA FOR
PRN17 FOLLOWING THE MANEUVER. PHASE USERS SHOULD BE AWARE OF THE
ADJUSTMENT TO THE ORBITAL POSITION OF PRN17 AND CORRECT RANGE
DATA ACCORDINGLY.