White lights on a vessel typically indicate the presence of a stern light or a masthead light. A stern light is positioned at the rear of the vessel and is visible from behind, while a masthead light is found at the top of the vessel's mast and shines forward. Both lights are essential for navigation and safety, helping to indicate the vessel's presence and direction to other mariners. In some cases, all-around white lights may also indicate that a vessel is anchored or aground.
At night the towing vessel should show two white lights on top of each other to indicate that it is towing.
In maritime navigation, visible white lights indicate a vessel's masthead light or stern light, while green lights signify the starboard side of a vessel. When encountering another vessel in darkness, if you see a green light, it means the vessel is approaching from your right side. Conversely, a visible white light could suggest that you are either approaching the stern of the vessel or that it is facing you. Understanding these light signals helps in determining the direction and movement of nearby vessels to avoid collisions.
white over red are the lights for a pilot vessel.
You are approaching the starboard side of another vessel
You are approaching the port side of another vessel
In darkness or reduced visibility, the white light indicates a vessel's stern, while red and green lights indicate the port (left) and starboard (right) sides, respectively. A vessel displaying a red light is facing another vessel, while a green light indicates it is on the starboard side. This color coding helps mariners determine the direction and type of vessel they are encountering, ensuring safe navigation.
another vessel is at anchor
A commercial vessel towing at night displays a white towing light above the stern of the towing vessel and a second white light at the stern of the tow. Additionally, the vessel should show a green light on the starboard side and a red light on the port side, as well as an all-round white light at the stern of the vessel being towed. These lights help indicate the vessel's activity and ensure safe navigation for other vessels.
The red and green lights indicate that the other boat is a sailing vessel, with the red light on the port (left) side and the green light on the starboard (right) side. The presence of a white light suggests it is either a power-driven vessel or a sailing vessel under certain circumstances. The combination of these lights means you should assess your course to avoid a collision, as their orientation indicates the other vessel's direction and status. Always prioritize safe navigation and adhere to the rules of the road.
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
White lights displayed above cabin
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.