NOTICE ADVISORY TO NAVSTAR USERS (NANU) #009-91009
SUBJ: PRN 16 USABLE DAY 009/1639 UTC (REF: NANU#276-90365)
1. CONDITION: PRN 16 RETURNED TO USABLE STATUS ON DAY 009 (09 JAN
91) AT APPROXIMATELY 1639 UTC. THE FREQUENCY STANDARD FOR PRN 16
WAS CHANGED TO A CESIUM CLOCK.
2. RECOMMENDATION: CONFIRM AVAILABILITY OF SATELLITES PRIOR TO USE.
3. POINT OF CONTACT: MAJ WILLIAM FAUVER AT COMMERCIAL (719)550-6379
OR AUTOVON 560-6379.