ZCZC JA14 241403 UTC JUL 26 VARNA RADIO NAVWARN 500/ 6 NORTH-NORTHEAST OF C*PE SHABLA. HYDROGRAPHIC CUTTER 231 WILL CARRY OUT HYDROGRAPHIC ACTIVITIES FM 0400 TO 1500 UTC FROM 27 TO 31 JULY 2026.ALL SHIPS TO KEEP A SAFETY DISTANCE OF 3 CABLES. NNNN