27[1685] Which vessel is underway according to the Rules?______

A. A vessel made fast to a single point mooring buoy B. A purse seiner hauling her nets

C. A pilot vessel at anchor D. A vessel which has run aground

28[2458]A vessel is in sight of another vessel when ______.

A. she can be observed by radar

B. she can be observed visually from the other vessel

C. she can be plotted on radar well enough to determine her heading

D. her fog signal can be heard

29 0365 Every vessel shall at all times maintain a proper lookout ______.

A. By sight.

B. By sight and hearing.

C. By sight and hearing as well as by all available means appropriate to the prevailing circumstances.

D. By sight and hearing as well as by all available means except smelling.

30[1475] When is a stand-on vessel FIRST allowed by the Rules to take action in order to avoid collision?

A. When the two vessels are less than half a mile from each other.

B. When the give-way vessel is not taking appropriate action to avoid collision.

C. When collision is imminent. D. The stand-on vessel is never allowed to take action.

31[210]A light signal consisting of three flashes means ______.

A. I am in doubt as to your actions

B. My engines are full speed astern

C. I desire to overtake you

D. I am operating astern propulsion