ZCZC SA21 NCC-HAMBURG 280420 UTC APR 26 NAV. WARN. NO. 243 GERMAN BIGHT. WEISSE BANK. SURVEY OPERATIONS BY MV 'FUGRO SYNERGY', CS 'C6XR3', AROUND POSITION 54-50N 006-12E RESTRICTED MANOEVRABILITY DURING OPERATIONS, BERTH OF 2 NM REQUESTED. NNNN