A.is a specialist hired for his local navigational knowledge
B.is solely responsible for the safe navigation of the vessel
C.relieves the Master of his duties
D.relieves the officer of the watch
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A.A sternlight only
B.Anchor lights only
C.A white light over a red light only
D.A white light over a red light and anchor lights
A.Riggins
B.Gears
C.Boarding arrangements
D.Fittings
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The radiotelephone required by the Vessel Bridge-to-Bridge Radiotelephone Act is for the exclusive use of （）.
Place names used should be those （）.
From （）the mariner can understand the data of tide．
THE SPEED OF A VESSEL ADJUSTED TO THAT OF A PILOT BOAT AT WHICH THE PILOT CAN SAFELY EMBARK is （）.
The first indications a mariner will have of the approach of a warm front will be （）.
Vessels must （） pilot at waiting anchorage．
Which vessel may show three lights in a vertical line，the top and bottom being red and the middle being white? （）
The single letter G，sent by an icebreaker to an assisted vessel，means （）.
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（）.
There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．