20.Located: In warnings: position of object confirmed.（依據IMO SMCP） (A)navigational (B)position (C)sailing (D)weather

29.“Ease to five” means: (A)to put the rudder at port side five degrees. (B)to put the rudder at starboard side five degrees. (C)to backs the rudder at five degrees of same side. (D)you may put the rudder within five degrees range either port or starboard.