ZCZC FA20 260500 UTC APR ESTONIAN NAV WARN 060/26. NORTHERN BALTIC. BETWEEN SAAREMAA AND HIIUMAA ISLAND. 290500-291300 UTC APR EXERCISE TAKING PLACE IN AREA BOUNDED BY: 58-54.98N 022-05.32E 58-52.94N 022-10.72E 58-44.57N 022-07.42E 58-30.22N 021-58.52E 58-31.08N 021-54.24E 58-49.01N 021-53.83E SHIPPING IN AREA TEMP PROHIBITED STANDING BY VHF CH 16 CANCEL 291300 UTC APR. NNNN