A buoy with the number 4 and a flashing red light typically indicates a navigational marker that signals the presence of a hazard or a specific channel. When traveling upstream at dusk, the flashing red light serves as a warning to boaters to exercise caution in that area. It’s essential to keep the buoy on your port (left) side when navigating upstream, as it helps indicate the correct course through the waterway. Always refer to local navigation charts for specific meanings and regulations associated with buoys.
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?
keep the buoy on the starboard side
When you see a buoy with the number 4 and a flashing red light while traveling upstream at dusk, you should treat it as a navigational warning. The red light typically indicates a hazard or an area to avoid. It's important to reduce your speed and proceed with caution, keeping a safe distance from the buoy. Additionally, consult your navigation charts or local regulations to understand the specific implications of that buoy's signal.
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.
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
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.
When traveling upstream and encountering a buoy with a flashing red light and the number four, you should recognize that this indicates a hazard or a danger area, typically marking the edge of a channel or an obstruction. It's important to maintain a safe distance from the buoy and reduce your speed to navigate cautiously. Ensure to stay vigilant for any other navigational aids or hazards in the area as visibility decreases at dusk. If uncertain, consider turning back or seeking a safe place to anchor until visibility improves.
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
A buoy with the number 4 and a flashing light typically indicates a navigational marker, often used to signify a channel or hazard. You should maintain a safe distance from the buoy, keeping it on your starboard (right) side if you are traveling upstream or toward the port (left) side if going downstream, depending on local navigation rules. Always consult the relevant nautical charts and guidelines for the specific area to ensure safe navigation.
One prolonged blast every two minutes
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You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?