Question 564 Rules of the Road

The correct answer is A) intermittent flashing amber/yellow light. According to the U.S. Coast Guard Navigation Rules, International - Inland, an intermittent flashing amber/yellow light may be displayed to assist in the identification of submarines operating on the surface. This light is specifically used to indicate the presence of a submerged vessel that has surfaced and is operating on the surface. The other options are incorrect because: B) a flashing white light is not a light specifically designated for submarine identification, C) a flashing sidelight is used for navigation purposes, and D) a blue rotating light is typically associated with emergency/law enforcement vehicles, not submarines.