NOTICE ADVISORY TO NAVSTAR USERS (NANU) #033-95051 SUBJ: PRN28 UNUSABLE 051/0915-UNTIL FURTHER NOTICE. 1. CONDITION: PRN28 (SVN28) WAS UNUSABLE ON DAY 051 (20 FEB 95) BEGINNING 0915 UTC UNTIL FURTHER NOTICE. 2. POC: LT ALBERTS AT COMMERCIAL (719) 550-6378 OR DSN 560-6378.