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It must have a navigation light visible from ahead to 22.5 degrees abaft the beam, on each side, green on the starboard side and red on the port side. It must have a white stern light visible over an arc of 135 degrees. If longer than 80 metres it must also have two white lights both visible in an arc of 225 degrees about the bow, both lights to be spaced along on the centre line of the ship, with the forward one lower than the other one.

The point about the coloured lights is that the ship must always give way to a vessel on the starboard side. At night it shows the green light on that side. The red light on the other side tells another ship that it must give way by slowing down or changing course to starboard.

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12y ago

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