22:31:44 2018-05-05 ZCZC DA89 052030 UTC MAY 18 ISTANBUL TURK RADIO NATEX NW NRC PTPRXQI SEA OF MARMARA OCEANOGRAPHIC SURVE, BY R/V TUBITAK MARMARA AND R/V TUBITAK AADOLU BETWEEN 24 APR-25 .-6 1 MONJZMARMARAN STRAITOF ISTANBUL HALIC AND BLACK SEA ENTRANCTC DA41 052P UTC MAY QI ISTANBUL TURK RADIO 050743 UTC MAR 18 NAVTEX NW NR:339/18 STRAIT OF CANAKKALE PIPELAYING OPERAIONS BY TOPAZ COMMANDER FROM 07 MAR UNTIL FURTHER NOTICE IN AREA BOUNDED BY: 40 25.73, 027 04.57E 40 32.57N 026 55.57E 40 33HN 026 57973 40 26.55N 027 05.53E WDEBERTH REQUESTED NNNN