The head and port side of the vessel is toward you
Answer The red light is the port side light which is on the left side of the boat. So if you can only see the red light, the boat has its left side toward you with its bow to the left of the red light and the stern to the right of the red light.
If you can only see the red light, then that boat has the right of way and you have to manoeuvre to avoid it. The default manoeuvre is to steer starboard (right)which will take you behind the other boats direction of travel.
(The starboard (right) side light is green.)
When boating at night a red and white light on a vessel tells you that you must give way to the other vessel.
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
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.
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).
fishing at night
you are on the port side of the vessel
white over red are the lights for a pilot vessel.
another vessel is at anchor
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.
Left.
It would mean that the other vessel is bow on to where you are looking.
It depends on its relative bearing and also its proximity.