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There should be no confusion, there is ONLY one instance where "right of way" is defined, Rule 9. There is only Stand-on vessels and Give-way vessels.

From the 1972 Convention on the International Regulations for Preventing Collisions at Sea (72 COLREGS) International

Lights and Shapes

Rule 21

Definitions(b) "Sidelights" means a green light on the starboard (right) side and a red light on the port (left) each showing an unbroken light over an arc of the horizon of 112.5 degrees and so fixed as to show the light from right ahead to 22.5degrees abaft the beam on it's respective side.

There are more uses for a green light on a vessel, but this will be the most common. Please refer to the Navigational Rules of the Road link below.

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12y ago
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8y ago

The green light on a boat signifies the starboard side (right). There will be a red light visible on the port side (left). If you see both lights at the same time then you are on a collision course with the other vessel.

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Q: What does one green light on a boat mean?
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What does it mean when you see a red and green light on another boat?

If you see both the red and green lights but not the white one, the boat is coming right for you and something's wrong because the white light has to be visible from any angle for a distance of two miles. <<>> If there's no white light it's a sailing boat. If you see red and green the boat is under sail and you are lined up with its bows. A small motor boat also needs a white light high up and visible all round.


What does it mean when you see only a red and green light on another boat?

If you see both the red and green lights but not the white one, the boat is coming right for you and something's wrong because the white light has to be visible from any angle for a distance of two miles. <<>> If there's no white light it's a sailing boat. If you see red and green the boat is under sail and you are lined up with its bows. A small motor boat also needs a white light high up and visible all round.


What does it mean when you only see red and green lights on another boat?

If you see both the red and green lights but not the white one, the boat is coming right for you and something's wrong because the white light has to be visible from any angle for a distance of two miles. <<>> If there's no white light it's a sailing boat. If you see red and green the boat is under sail and you are lined up with its bows. A small motor boat also needs a white light high up and visible all round.


What does a red and green light indacate when seen together at night on a boat?

Spotting a red and a green light on a boat at night is an indication that the boat has its bow pointed in your direction. If the boat is under way, it's coming at you.The red light is on the port or left side, the green on the starboard or right. These lights cannot be seen from dead astern, and only one color can be seen from beside (abeam) of the vessel.


What do red and green lights on a boat mean?

The red and green lights on a boat are side lights and assist in determining the direction the boat is facing. Red lights are on the port, or left side, while green lights are on the starboard, or right side. If you see only one side light, you are looking at that side of the boat. If you see both lights at the same time, that means that the boat is either headed towards you or away from you. If the red light is to the right, the boat is coming towards you (Red-Right-Returning). If the green light is to the right, the boat is going away from you. See the associated link for US Coast Guard Navigational Rules of the Road


What side is a green light on a boat on?

The starboard, or right hand, side- the one on the port side is red.


If you see red green and white light on another boat what does this tell you?

The port side of a vessel carries a red light, whilst the starboard side carries a green one. A white light would be either in the centre to act as a headlight or extra illumination for the benefit of other vessels, or on the masthead to indicate the height of the boat.


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