Question 225 Rules of the Road

The correct answer is C) alter your course to starboard. This is because when you sight another power-driven vessel dead ahead showing both the red and green sidelights, it indicates that the other vessel is on a collision course with you. According to the International Regulations for Preventing Collisions at Sea (COLREGS), the action required in this situation is to alter your course to starboard to avoid a collision. The other options are incorrect because: A) watching the compass bearing does not take any action to avoid the collision, B) altering to port would put you on a more dangerous collision course, and D) starting a radar plot would not immediately resolve the collision situation.