ZCZC FA15 280701 UTC AUG ESTONIAN NAV WARN 140/26 GULF OF FINLAND. 310700 - 311300 UTC AUG NE OF OSMUSSAAR ISLAND FIRING PRACTICE AREA 1A CENTRED 59-22.0N 023-33.0E FIRING EXERCISES IN PROGRESS. OTHER VESSELS MUST AVOID ENTRY INTO THE AREA. STANDING BY VHF CH 16 AND 61. CANCEL 311300 UTC AUG. NNNN