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It tells you which side of the boat is facing you allowing you to pass on the right or left of the oncoming vessel.

If you see red and green (with the red on the right and the green on the left), it's a vessel heading directly towards you (although its course may be different). The white (single) light would indicate that it is a powered vessel as opposed to a sailing vessel. [rhm]

If you observe just the red light on a ship, they have the right-of-way and you are to maneuver to stay clear. In this case, both vessels should take precautions. In any case, the default maneuver is to turn starboard (to the right).

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Q: When boating at night what do red and green lights on a vessel tell you?
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Related questions

When boating at night what do a red green and white light on another vessel tell you?

During nighttime transit another boat's lights show: Green - the right, or starboard side, of that vessel; Red - the left, or port side, of that vessel; White - the rear of that vessel. The vessel is heading directly toward you


When boating at night when does a single white light on a vessel tell you?

When boating at night, a single white light on a vessel tells you that it is anchored.


When boating at night what does a red and white light on a vessel tell you?

When boating at night a red and white light on a vessel tells you that you must give way to the other vessel.


When boating at night what does a green and white light on a vessel tell me?

You are the stand-on vessel but should take precautions in case the other operator doesn't see you.


What does it mean when you see only a red and a green light on a vessel at night?

Navigation lights, green starboard and red port. Masthead and stern lights should be white


When boating at night what does a single white light boat tell you?

Lighting requirements vary depending on whether you're talking about a sailboat or powerboat, International Rules or Inland Rules, the length of the vessel, and whether or not the vessel is at anchor. However, if at night you see a single white light only (no red or green lights), you're most likely looking at a boat at anchor.


When boating at night what does a single white light on a boat?

Lighting requirements vary depending on whether you're talking about a sailboat or powerboat, International Rules or Inland Rules, the length of the vessel, and whether or not the vessel is at anchor. However, if at night you see a single white light only (no red or green lights), you're most likely looking at a boat at anchor.


The night lights exhibited by a pilot vessel?

white over red are the lights for a pilot vessel.


A power driven vessel boating at night in which direction should the green side light be shining?

From dead ahead to 22.5 degrees abaft the starboard beam


You are operating a powerboat at night You see green and white lights on another boat What do these lights tell you?

You are the stand-on vessel but be prepared to give way if necessary. When you see a white and a green light, you are the stand-on vessel. You should remain alert, however, in case the other vessel operator does not see you or does not know navigational rules.


You are operating a powerboat at night you see a green and white lights on another boat what do these lights tell you?

You are the stand-on vessel but be prepared to give way if necessary. When you see a white and a green light, you are the stand-on vessel. You should remain alert, however, in case the other vessel operator does not see you or does not know navigational rules.


What lights are needed for boating at night?

Head lights, port, starboard and stern lights (on 28' pontoon boat).