Question 180Navigation General

The correct answer is B) should be left to port when heading out to sea. Under the IALA-A Buoyage System, a green spar buoy with a triangular topmark indicates that the buoy is marking the starboard side of a channel when heading out to sea. This means the vessel should pass to the port (left) side of the buoy when navigating out to open water. The triangular topmark is a visual cue that the buoy is marking the starboard side of the channel. The other answer choices are incorrect because: A) a green buoy does not indicate the north side of a point of interest, C) a green buoy with a triangular topmark is not a "may" buoy to be passed on either side, and D) the buoy is marking the starboard side of the channel, not the preferred channel.