ZCZC FA57 230915 UTC JUL PETERSBURG NAV WARN 154/26 EASTERN GULF OF FINLAND. SHIPS EXERCISES 312100 UTC JUL THRU 312100 UTC AUG IN AREA TEMPORARILY DANGEROUS TO SHIPPING: 59-53.43N 027-05.35E 59-53.43N 027-09.63E 59-46.43N 027-09.63E 59-46.43N 027-05.35E CANCEL THIS MESSAGE 312200 UTC AUG. NNNN