The stern light needs to be visible across 135 degrees and from two miles away.
Visible white green and red lights on a boat.
Stern lights are white and shine aft and 67 5 forward on each side.
In addition to red white and green running lights a combination of red white and green mast lights placed on a mast higher than all the running lights and viewable from all directions may be used to indicate the type of craft or the service it is performing.
All other lights must be visible for 2nm.
A steady red light marks the port left side of a boat.
If you meet a vessel and see a green and red light but no masthead white light then you are approaching a sail driven vessel.
A steady green light marks the starboard right.
A stern light which is a white light at the rear of the boat.
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If a green and a white light are visible then another craft is approaching you from the port left side.
Port sidelights are red starboard sidelights are green and both shine from dead ahead to 112 5 aft on either side.
A white stern light located at the rear of the boat that is visible at 135 degrees and can be seen from 2 miles away.
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Alternatively for sailboats of that are over 7 meters in length they can display what is called a tricolor light.
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A steady yellow light marks the stern back of a tug pushing barges.
A pair of red and green sidelights that are visible 112 5 degrees and can be seen at least one mile away.
You are approaching a powerboat head on.
Finally you need one pair red and green sidelights that are visible across 112 5 degrees and from a distance of one mile.
When only a red light is visible you are approaching the port side of a sailboat.
When you are in a power driven pleasure craft and you see a red a green and a white light you are approaching another power driven vessel head on and both vessels must give way.
White lights are masthead lights or stern lights on the back of the boat.
Boat over 20m 65 7 and less than 50m 164 must display a masthead light visible for 5nm.
What do visible white green and red lights indicate.
You are the give way craft and must yield right of way to the sailing vessel.
All other lights.
The lights are screened shielded so that each light is only visible from a certain range of directions if you are on a boat and can see the red green and white navigational lights from another.
When the masthead light and the stern light are combined that makes up 360 degrees.
When white and green lights are visible you are approaching the starboard side of a powerboat.