ZCZC IA23 020701 UTC JUL BALTIC SEA NAV WARN 026/26 LOW SEA LEVEL THE BELTS: THURSDAY EVENING BRIEFLY AROUND -50 TO -60CM CM BELOW BALTIC SEA CHART DATUM WESTERN BALTIC: THURSDAY EVENING TO FRIDAY EVENING AROUND -50 TO -60CM CM BELOW BALTIC SEA CHART DATUM NNNN