ZCZC FA85 170632 UTC OKT ESTONIAN NAV WARN 178/26 GULF OF FINLAND 20 OCT 06:00-13:00 UTC AND 21-23 OCT 07:00-15:00 UTC DAILY FIRING PRACTICE AREA 4B CENTRED 59-37.0N 026-22.0E MILITARY EXERCISE IN PROGRESS OTHER VESSELS MUST AVOID ENTRY INTO THE AREA CANCEL 231500 UTC OCT NNNN