ZCZC JA61 170915 UTC SEP GERMAN NAV WARN 523/26 SOUTHWEST OF OFFSHOREWINDPARK 'BALTIC 1'. UNDERWATER OPERATIONS BY 'NORTHERN STORM'/MISA7 BETWEEN PSN: 54-13.33 012-07.9E AND 54-36.8N 012-37.8E. RESTRICTED MANOEVRABILITY DURING OPERATIONS. 05 NAUTICAL MILES BERTH REQUESTED. NNNN