ZCZC FA28 300902 UTC APR LATVIAN NAV WARN 012/26 BALTIC SEA. GULF OF RIGA: NAVAL FIRING EXERCISES FROM 041100 UTC TO 041900 UTC MAY AND 050700 UTC TO 051900 UTC MAY IN AREA M1 CENTERED IN 57-26N 023-45E. AREA CLOSED FOR NAVIGATION DURING EXERCISES. WIDE BERTH REQUESTED. CAN THIS MSG 052000 UTC MAY. NNNN