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You are approaching a sailing vessel - head-on
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
You are approaching the starboard side of another vessel
You are approaching the stern of another vessel
You are approaching the stern of another vessel and may be overtaking it
You are approaching the port side of another vessel
It depends on the configuration seen. There are different lights visible depending on the relative headings of the vessels and relative sizes etc.
A vessel displaying a visible white light signifies that it is a power-driven vessel. Observing this light helps determine the vessel's status and potential course of action to avoid a collision.
How the two vessels are propelled
When the motorized vessel is a commercial vessel or when the motorized vessel has another vessel or person in tow.
white over red are the lights for a pilot vessel.