ZCZC JA49 261200 UTC MAY LATVIAN NAV WARN 014/26 CENTRAL BALTIC SEA LIEPAJA NORTHWARDS. DRONE EXERCISE IN PROGRESS ON MAY 28 - 29 FROM 0500-1500 UTC IN M2 AREA WITH A RADIUS OF 8 NM FROM CENTER PSN N 56-43.00N 020-52.00E. AREA CLOSED FOR NAVIGATION DURING EXERCISE WIDE BERTH REQUESTED INFORMATION ON RESTRICTIONS ON VHF CH 16 CANCEL THIS MSG ON 291500 UTC MAY NNNN