Question

if you encounter this green marker buoy when heading in the upstream direction (returning from sea), how should you proceed? a keep the marker on your starboard (right) side b keep the marker on your port (left) side c pass on either side of the marker d turn around; you may not proceed any further

Explanation:

According to maritime navigation rules, when returning from sea (upstream direction), green markers (also known as port - hand buoys) should be kept on the port (left) side of the vessel. This helps in following the correct navigable channel. Option A is incorrect as red markers (starboard - hand buoys) are kept on the starboard side. Option C is for special markers like isolated - danger marks (which are not green port - hand buoys). Option D is not relevant for a standard green port - hand buoy when proceeding in the correct upstream (returning from sea) direction.

Answer:

B. Keep the marker on your port (left) side