a sailing vessel is approaching head on and you must give way
You are seeing a vessel from the rear, or it is at anchor.
Navigation lights, green starboard and red port. Masthead and stern lights should be white
It would mean that the other vessel is bow on to where you are looking.
A white light used by itself which can be seen in all directions is the anchor light, which means you are anchored. A white used in conjunction with bow lights (green and red) are your navigation lights. The white light indicates your stern ( back of boat). If all you can see is the white light, a boat is either anchored or underway going away from you.
Small boat light.
A white light seen on a vessel in darkness indicates that the vessel is approaching you directly or near head-on. It suggests that both vessels should alter their course to avoid a collision, typically passing to the starboard (right) of the other vessel.
A green light is on the starboard side of the vessel. So it may mean that the starboard side is directly facing you.
Sailing vessel is approaching head on you must give away
Sailing vessel is approaching head on you must give away
Sailing vessel is approaching head on you must give away
White and red lights can mean a whole host of things on vessels, which is dependent on the configuration of which you are seeing them. In thee MOST basic way to answer this with out knowing what you are seeing, I am going to assume you are seeing a port side-Red (left) running light and a white mast head light. Again if it was red over white or white over red it would mean entirely different things.Red on the left or Port-side (I LEFT the RED PORT wine at home.) and Green on the right or Starboard side are basic navigation running lights.Red above White = Fisherman's Delight: The two lights near the middle of the boat and up high indicate a fishing boat at work. They are the "stand-on".White above Red = Pilot Ahead: The two lights near the middle of the boat and high up indicate a pilot boat at work: They are the "stand-on" vessel.