The same thing it does during the day.
A red and green light seen together at night typically indicates a navigation buoy marking a channel in the water. The red light is typically on the left (port) side of the channel when entering from seaward and the green light is on the right (starboard) side. This configuration helps boaters determine the proper direction of travel to safely navigate the channel.
Sail boat is coming at you
Sail boat is coming at you
another vessel is at anchor
At night, red and green lights are commonly used in aviation and maritime contexts. For aircraft, a red light is typically the left navigation light, while a green light indicates the right navigation light, helping pilots determine the orientation of other planes. In maritime settings, red and green lights serve a similar purpose for boats, indicating the port (left) and starboard (right) sides, respectively. This color coding aids in safe navigation and collision avoidance in low visibility conditions.
a sail boat is heading straight at you
Navigation lights, green starboard and red port. Masthead and stern lights should be white
The red light is on the port side of the boat, while the green light is an the starboard side. So, if the boat in front is showing a red light on the left and a green light on the right, it is going away from you.
The red light is on the port side of the boat, while the green light is an the starboard side. So, if the boat in front is showing a red light on the left and a green light on the right, it is going away from you.
The red light is on the port side of the boat, while the green light is an the starboard side. So, if the boat in front is showing a red light on the left and a green light on the right, it is going away from you.
The red light is on the port side of the boat, while the green light is an the starboard side. So, if the boat in front is showing a red light on the left and a green light on the right, it is going away from you.
fishing at night
A red and green light seen together at night typically indicates a navigation buoy marking a channel in the water. The red light is typically on the left (port) side of the channel when entering from seaward and the green light is on the right (starboard) side. This configuration helps boaters determine the proper direction of travel to safely navigate the channel.
Sail boat is coming at you
A red light on the left and a green light on the right indicate that you are looking at the port (left) side of a boat that is heading toward you at night.
Red marks the Port or left side. (Green is Starboard or the right-hand side.) Port
Sail boat is coming at you