At sea, at night, the lights on the boats give indications to be able to differentiate them. All vessels must turn on their lights as soon as the sun sets, or during the day when visibility is reduced.
Mandatory navigation lights
In our example, we see a red light topped by a white light. According to the regulations set by the International Regulations for the Prevention of Collisions at Sea or RIPAM, these indications define a motorboat under 50 m. By seeing its red light, we know that we are in its port bow sector, a sector of 112.5°. A little revision on the main lights is necessary ? See our topic which summarizes the different situations .
No collision course
When we see the red light of this boat coming, which is also in our red sector, we can say that our paths will not cross. Here is a mnemonic to help you remember this: "Red on red nothing moves. Green on green everything is clear" . So there is no need to change our route. We will pass at the back of the boat and our paths will not cross. The correct answer is D.
