ZCZC KA91 AVURNAV CHERBOURG 91/26 WIGHT - DST BOULOGNE AIDS TO NAVIGATION CHANGES LIGHT UNRELIABLE VERGOYER SW BUOY BOULOGNE TSS VERGOYER SW MARK: WEST CARDINAL 50-27.00N 001-00.00E BUOY LIGHT OPERATION UNRELIABLE NAVIGATE WITH CAUTION NNNN