NOTICE ADVISORY TO NAVSTAR USERS (NANU) #087-94062 SUBJ: PRN28 SET USABLE DAY 062 AT 0305 UTC. 1. CONDITION: PRN28 (SVN28) WAS SET USABLE ON DAY 062 (03 MAR 94) AT 0305 UTC. 2. POC: CAPT THOMPSON AT COMMERCIAL (719) 550-6378 OR DSN: 560-6378.