ZCZC FA79 ESTONIAN NAV WARN 174/2026 GULF OF FINLAND 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 151400 UTC OCT NNNN