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A vessel engaged in fishing
A white light is the color of light that must be displayed on a vessel towing at night, I t must be displayed at 8.2 feet higher than the colored sidelights. It should have an all round white light visible for 2 miles.
Generally they are masthead light, port and starboard steaming light and stern light. Others may be displayed depending on the length of the vessel and what duties it is carrying out.
sailer of a light fast vessel
The characteristics of navigation lights on a power driven vessel includes sidelights, sternlight, masthead light, and all-round white lights. Navigation lights must be displayed from sunset until sunrise as well as anytime visibility is restricted.
When boating at night a red and white light on a vessel tells you that you must give way to the other vessel.
you are following another vessel on it's starboard side. the stern light and stbd running light are visible
When boating at night, a single white light on a vessel tells you that it is anchored.
you are on the port side of the vessel
The right side of the vessel is the starboard side, the light is green. The light is coordinated to the starboard side of the vessel no matter how you look at it. Refer to Rule 21 of the 72 COLREGS, a link is provided below.
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.
Without seeing the actual configuration there isn't enough information to make a decision. Am I seeing the port side aspect of of the vessel? A port side running light at 112.5 degrees and a masthead light at 225 degrees? Where are the lights in relation to each other? Also with the information you have given it could be a a fishing vessel other than trawling, underway, not making way (red over white). OR it could be a pilot boat underway, engaged in pilotage duty (white over red).