单项选择题
A.relieves the Master of his duties
B.is solely responsible for the safe navigation of the vessel
C.is a specialist hired for his or her local navigational knowledge
D.relieves the officer of the watch
单项选择题 When the movement of engine is no longer required the pilot usually gives the order like this（） .
单项选择题 When a tug is pulling on a hawser at right angles to the ship，and the pilot wants to come ahead or astern on the ship’s engine，care must be taken that the pilot（）.
单项选择题 When a pilot is on board to pilot the vessel the Letter （） must be hoisted．