NOTICE ADVISORY TO NAVSTAR USERS (NANU) #091-96131 SUBJ: PRN20 UNUSABLE 131/1518 UNTIL FURTHER NOTICE REF: NANU 090-96131 (DTG 101701Z APR 96) 1. CONDITION: GPS SATELLITE PRN20 (SVN20) WAS UNUSABLE ON JDAY 131 (10 MAY 96) BEGINNING 1518 ZULU UNTIL FURTHER NOTICE. 2. POC: NAVIGATION ANALYST AT COMMERCIAL (719) 567-6378 OR DSN 560-6378.