ZCZC FA73 090900 UTC APR LATVIAN NAV WARN 009/26 CENTRAL BALTIC. LIEPAJA NORTHWARDS. FIRING EXERCISE IN PROGRESS ON APR _IPP UTC IN 'M2' AREA WITH A RADIUS OF 8 BM__ZM CENTER PSN N 56-41.00N 020-52.00E. AREA CLOSED FOR NAVIGATION DURING EXERCISE. WIDE BERTH REQUESTED. INFORMATION ON RESTRICTIONS ON VHF CH 16. CANCEL 131800 UTC APR NNNN