ZCZC SA75 NCC-HAMBURG 300830UTC APR 26 NAV. WARN. NO. 248 GERMAN BIGHT. NORTHEASTERLY _PFJJPMLV_SURVEY OPERATIONS IN PROGRESS BY MV 'KOMMANDOR ORCA', CS 'MKFI8', AROUND POSITION 55-10N 006-11E RESTRICTED MANOEVRABILITY DURING OPERATIONS. BERTH OF 1 NM REQUESTED. NNNN