ZCZC FA13 252304 UTC APR PETERSBURG NAV WARN 074/26 EASTERN GULF OF FINLAND. SHIPS EXERCISES 302100 UTC APR - 312100 UTC MAY 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 MSG 312200 UTC MAY. NNNN