ZCZC UA63 302320 UTC APR 26 MONDOLFO RADIO COASTAL WARNING 172/26 APR 05 (6 REPETITION) CENTRAL ADRIATIC SEA PESCARA. FAILURE OF THE OPTICAL NAVIGATION AIDS SYSTEMS ON THE GIOVANNA PLATFORM IS REPORTED IN POSITION: LAT. 42 46 02 N LONG. 014 27 50 E. TRANSITTING VESSELS PLEASE PAY MAXIMUM CAUTION. NNNN