ZCZC UA26 192320 UTC APR 26 MONDOLFO RADIO COASTAL WARNING 022/26 APR 17 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