ZCZC FA52 240501 UTC MAY ESTONIAN NAV WARN 072/26 GULF OF FINLAND. 270700 - 271300 UTC MAY 280800 - 281400 UTC MAY W OF NAISSAAR ISLAND FIRING PRACTICE AREA 2A CENTRED 59-35N 024-19E FIRING EXERCISES IN PROGRESS. OTHER VESSELS MUST AVOID ENTRY INTO THE AREA. STANDING BY VHF CH 13 AND 61. CANCEL 281400 UTC MAY. NNNN