ZCZC JA61 090900 UTC APR LATVIAN NAV WARPOXWY CENTRAL BALTIC. LIEPAJA NORTHWARDS. FIRING EXTRCISE IN PROGRESS ON APR 13 0400-1800 UTC IN 'M2' AREA WITH A RADIUS OF 8 NM FROM CENTER PSN N 56-41.00N 020-52.00E. AREA CLOSED FOR NAVIGATION DURING EXERCISE. WIDE BERTH VE_CPJHPW_INFORMATION ON RESTRICTIONS ON VHF CH 16. CANCEL 131800 UTC APR NNNN