ZCZC FA22 071221 UTC SEP ESTONIAN NAV WARN 148/26 GULF OF FINLAND. 100600 - 101300 UTC SEP FIRING PRACTICE AREA 4B CENTRED 59-38N 026-22E EXERCISE IN PROGRESS. OTHER VESSELS MUST AVOID ENTRY INTO THE AREA. STANDING BY VHF CH 61. CANCEL 101300 UTC SEP. NNNN