ZCZC *A49 041*WU UTC APR DANISH NAV WARN 183/26 DENMARK. SOUND.*DROGDEN. AN*UNCHARTED OBSTRUCTION OBS*RVED 55-33.9N 012-42.3E. OBS**UCTION VISIBLE ABOVE SEA SURFACE AND IS A RED BUOY. MARINERS ARE ADVISED TO KEEP WELL CLEAR. NNNN