lp
You are traveling upstream on a river at dusk. You see a buoy with the number 4 and a flashing red light. What should you do?
When going upstream, a buoy with a number 5 and flashing green light indicates the presence of a dam ahead. The dam may be used to generate hydroelectric power or to provide water for irrigation, and can pose a danger to boats and other vessels.
You go inside that space that has the bouy and stay to the port-side of the bouy.
Have the bout on your right
Since this is a Green Lighted Buoy sighted while approaching a harbour,this is a Lateral port hand side mark, IALA region B. To keep this buoy on your port side while travelling upstream.
no
Keep the buoy on your starboard (right) side.
keep the buoy on the starboard side
A green light
it doesn't indicate anything, aside from the fact that the buoy is there. the light simply makes it more visible in foggy or dark conditions.
Keep the buoy on your starboard side as you enter the harbor.
a red light, of course!