A.from the ship's propeller when making up aft
B.from being overrun if making up forward
C.hull damage while alongside passing a hawser
D.getting in a tripping position
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A.at any time while underway
B.while at anchor
C.while alongside a vessel
D.All of the above
A.when at anchor
B.only when making way
C.at any time when underway
D.only when the identifying lights are not being shown
A.underway，but not making way
B.aground
C.being towed
D.not engaged in pilotage duty
A.should never use radar bearings
B.should only use radar bearings when the range exceeds the distance to the horizon
C.can use radar information from one object to fix the position
D.must use information from targets forward of the beam
A.straight line
B.arc
C.parabola
D.line parallel to the coast
A.one sidelight and the masthead light are visible
B.the vessels will pass closer than half a mile
C.both vessels sound one prolonged blast
D.both sidelights and masthead light(s) are visible
A.required navigation lights
B.lifesaving equipment standards
C.casualty reporting procedures
D.currents in various locations
A.Tidal Current Tables
B.Tide Tables
C.American Practical Navigator
D.Sailing Directions
A.Admiralty Sailing Directions
B.Admiralty List of Lights
C.Admiralty List of Signals
D.Admiralty Notices to Mariners
A.corrections
B.publications
C.supplements
D.alterations
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Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
The height of tide is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
The distance between the surface of the water and the tidal datum is the （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
Conditions for crossing a rough bar are usually best at （）.
During a period of whiteout，you should expect which of the following（）.