ZCZC UA20 182320 UTC JUL 26 MONDOLFO RADIO COASTAL WARNING 022/26 APR 17 (23 REPETATION) CENTRAL ADRIATIC SEA. OPTICAL ACOUSTIC SYSTEMS TO HELP NAVIGATION OF THE PLATFORM 'CALPURNIA' -IN POSITION: - 43 53' 56''N - 014 09' 14''E THEY ARE NOT WORKING. TRANSIT SHIPS BEWARE. NNNN